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 (9th ed.) Citation
Heindel, Lee E., and Jerry T. Roberto. LANG-PAK: <an> Interactive Language Design System. American Elsevier Pub. Co, 1975.
Warning: These citations may not always be 100% accurate.