Edwards, L. E. (1973). PL/I for business applications. Reston Pub. Co..
芝加哥风格引文Edwards, Leonard E. PL/I for Business Applications. Reston, Va.,: Reston Pub. Co., 1973.
MLA引文Edwards, Leonard E. PL/I for Business Applications. Reston Pub. Co., 1973.
警告：这些引文格式不一定是100％准确.