Charles Philip Lecht. (1968). The programmer's PL/1: A complete reference. New York: McGraw-Hill.
Trích dẫn kiểu ChicagoCharles Philip Lecht. The Programmer's PL/1: A Complete Reference. New York: McGraw-Hill, 1968.
Deismireacht MLACharles Philip Lecht. The Programmer's PL/1: A Complete Reference. New York: McGraw-Hill, 1968.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.