Gaya APA

Heindel, L, E., Roberto, J, T. (1975). LANG-PAK: an interactive language design system . New York: American Elsevier Publishing Company, Inc..

Gaya MLA

Heindel, Lee, E.., Roberto, Jerry, T.. "LANG-PAK: an interactive language design system". New York: American Elsevier Publishing Company, Inc., 1975. Text.