APA استشهاد

Essick, E. L. (1973). RPG for system/360 and system/370. Harper & Row.

استشهاد بنمط شيكاغو

Essick, Edward L. RPG for System/360 and System/370. New York: Harper & Row, 1973.

MLA استشهاد

Essick, Edward L. RPG for System/360 and System/370. Harper & Row, 1973.