APA (7th ed.) Citation

Heindel, L. E., & Roberto, J. T. (1975). LANG-PAK, an interactive language design system. American Elsevier Pub. Co..

Chicago Style (17th ed.) Citation

Heindel, Lee E., and Jerry T. Roberto. LANG-PAK, an Interactive Language Design System. New York: American Elsevier Pub. Co., 1975.

MLA (8th ed.) Citation

Heindel, Lee E., and Jerry T. Roberto. LANG-PAK, an Interactive Language Design System. American Elsevier Pub. Co., 1975.