Angier, Natalie. “Friendship's Dark Side: ‘We Need a Common Enemy.'” New York Times, April 16, 2018. https://www.nytimes.com/2018/04/16/science/friendship-discrimination.html.
Beck, Julie. “How Friends Become Closer.” Atlantic, August 29, 2017. https://www.theatlantic.com/health/archive/2017/08/how-friends-become-closer/538092/.
Beck, Julie. “How Friendships Change in Adulthood.” Atlantic, October 22, 2015. https://www.theatlantic.com/health/archive/2015/10/howfriendships-change-over-time-in-adulthood/411466/.
Christakis, Nicholas A. Blueprint: The Evolutionary Origins of a Good Society. New York: Little, Brown, 2019.
Clark, Taylor. Nerve: Poise Under Pressure, Serenity Under Stress, and the Brave New Science of Fear and Cool. New York: Little, Brown, 2011.
Collier, Peter. Medal of Honor: Portraits of Valor Beyond the Call of Duty. New York: Artisan, 2001.
Demιr, Melιkşah, and Lesley A. Weitekamp. “I Am So Happy 'Cause Today I Found My Friend: Friendship and Personality as Predictors of Happiness.” Journal of Happiness Studies 8(2007): 181–211. https://link.springer.com/article/10.1007/s10902-006-9012-7.
Denworth, Lydia. Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond. New York: W. W. Norton, 2020.
Feeney, Brooke C., and Nancy L. Collins. “New Look at Social Support: A Theoretical Perspective on Thriving Through Relationships.” Personality and Social Psychology Review 19, no. 2 (2015): 113–47. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5480897/.
Flora, Carlin. Friendfluence: The Surprising Ways Friends Make Us Who We Are. New York: Knopf Doubleday, 2013.
Greif, Geoffrey L. Buddy System: Understanding Male Friendships. New York: Oxford University Press, 2008.
“Hector A. Cafferata, Eighty-Six, Dies; Given a Medal of Honor for Korean Heroics.” New York Times, April 15, 2016. https://www.nytimes.com/2016/04/15/us/hector-a-cafferata-a-medal-of-honor-recipient-dies-at-86.html.
Holt-Lunstad, Julianne. “Fostering Social Connection in the Workplace.” American Journal of Health Promotion 32, no. 5 (2018): 1307–12. https://journals.sagepub.com/doi/full/10.1177/0890117118776735a.
Hruschka, Daniel J. Friendship: Development, Ecology, and Evolution of a Relationship. Berkeley: University of California Press, 2010.
Lewis, C. S. The Four Loves. New York: HarperOne, 2017.
Mashek, Debra J., and Arthur Aron. Handbook of Closeness and Intimacy. Hove, UK: Psychology Press, 2004.
McKay, Brett. “Podcast #567: Understanding the Wonderful, Frustrating Dynamic of Friendship.” Art of Manliness, last updated September 30, 2021. https://www.artofmanliness.com/articles/podcast-567-understanding-the-wonderful-frustrating-dynamic-of-friendship/.
Misurelli, Frank. “Marine Corps Medal of Honor Recipient Hector A. Cafferata Remembered as Humble Hero.” U.S. Army, May 26, 2016. https://www.army.mil/article/168707/marine_corps_medal_of_honor_recipient_hector_a_cafferata_remembered_as_humble_hero.
Pahl, Ray. On Friendship. New York: Polity, 2000.
Pakaluk, Michael, ed. Other Selves: Philosophers on Friendship. Cambridge, MA: Hackett, 1991.
Parker-Pope, Tara. “How to Be a Better Friend.” New York Times, n.d. https://www.nytimes.com/guides/smarterliving/how-to-be-a-better-friend.
Powdthavee, Nattavudh. “Putting a Price Tag on Friends, Relative, and Neighbours: Using Surveys of Life Satisfaction to Value Social Relationships.” Journal of Socio-Economics 37, no. 4 (2008): 1459–80. https://www.sciencedirect.com/science/article/abs/pii/S1053535707001205.
Radiolab. “An Equation for Good.” New York Public Radio, December 14, 2010. https://www.wnycstudios.org/podcasts/radiolab/segments/103983-equation-good.
Rath, Tom. Vital Friends: The People You Can't Afford to Live Without. New York: Gallup, 2006.
Rawlins, William K. Friendship Matters: Communication, Dialectics, and the Life Course. New York: Aldine de Gruyter, 1992.
Rawlins, William K. The Compass of Friendship: Narratives, Identities, and Dialogues. Los Angeles: Sage.
Ruiz, Rebecca. “World's Friendliest Countries.” Forbes, December 1, 2009. https://www.forbes.com/2009/11/30/worlds-friendliest-countrieslifestyle-travel-canada-bahrain-hsbc-chart.html?sh=c35dff465730.
Russ, Martin. Breakout: The Chosin Reservoir Campaign, Korea 1950. New York: Penguin, 2001.
Schudel, Matt. “Hector Cafferata, Medal of Honor Recipient in Korean War, Dies at Eighty-Six.” Washington Post, April 14, 2016. https://www.washingtonpost.com/national/hector-cafferata-medal-of-honor-recipient-in-korean-war-dies-at-86/2016/04/14/9c7711a6-0259-11e6-b823-707c79ce3504_story.html.
Smith, Larry. Beyond Glory: Medal of Honor Heroes in Their Own Words. New York: W. W. Norton, 2004.
Tashiro, Ty. Awkward: The Science of Why We're Socially Awkward and Why That's Awesome. New York: HarperCollins, 2018.
Vernon, Mark. The Meaning of Friendship. London: Palgrave Macmillan, 2010.
Wikipedia. “Audie Murphy.” https://en.wikipedia.org/wiki/Audie_Murphy#Decorations.
Wikipedia. “Hector A. Cafferata Jr.” https://en.wikipedia.org/wiki/Hector_A._Cafferata_Jr.
Wikipedia. “List of Medal of Honor Recipients.” https://en.wikipedia.org/wiki/List_of_Medal_of_Honor_recipients.
