APA استشهاد

Van Gigch, J. P. (1974). Applied General Systems Theory. Harper and Row.

استشهاد بنمط شيكاغو

Van Gigch, John P. Applied General Systems Theory. New York: Harper and Row, 1974.

MLA استشهاد

Van Gigch, John P. Applied General Systems Theory. Harper and Row, 1974.