1. 参见J. W. Pomeroy, “A guide to programming tools and techniques,” IBM Sys. J., 11,3(1972), pp. 234-254.
2. Landy B., R. M. Needham, “ Software engineering techniques used in the development of the Cambridge Multiple-Access System” Software, 1,2 (April, 1971), pp. 167-173.
3. Corbato F. J. , “PL/I as a tool for system programming” Datamation, 15, 5(May, 1969), pp. 68-76.
4. Hopkins, M., “Problems of PL/I for system programming” IBM Research Report RC 3489. Yorktown Heights, N. Y., August 5, 1971.
5. Corbato F. J., J. H. Saltzer, and C. T. Clingen, “MULTICS - the first seven years”, AFIPS Proc SJCC, 40(1972) pp. 571-582. “出于达到最优性能的原因, 仅有半打使用PL/L编程的领域重新用汇编进行了改写. 许多最初使用机器语言编写的程序都用PL/L重新编写,译提高它们的可维护性.”
6. 引用Corbato论文中的参考资料3: "PL/I is here now and the alternatives are still untested". 同时,书写良好的提出反面意见的文章, 参见Henricksen J. O. and R. E. Merwin, “Programming language efficiency in real-time software systems”, AFIPS Proc SJCC. 40(1972). pp. 155-161.
7. 并不是所有人都同意. 在一次私下的交流中, Harlan Mills说: “我的经验开始告诉我, 在产品开发中, 将秘书安排到终端面前. 其思想是使编程成为在众多团队成员监督下, 更加大众化的实践, 而不是一项专有的技术..”
8. Yarr J., “Programming Experience for the Number 1 Electronic Switching System,” paper given at the 1969 SJCC.
