Ledgard, H. F., Nagin, P. A., & Hueras, J. F. (1979). PASCAL with style: Programming proverbs. Hayden Book Co..

Ledgard, Henry F., Paul A. Nagin, and John F. Hueras. PASCAL with Style: Programming Proverbs. Rochelle Park, N.J.: Hayden Book Co., 1979.

Ledgard, Henry F., et al. PASCAL with Style: Programming Proverbs. Hayden Book Co., 1979.