APA استشهاد

Gigch, J. P. V. (1974). Applied general systems theory. Harper &Row publishers.

استشهاد بنمط شيكاغو

Gigch, John P. Van. Applied General Systems Theory. london: Harper &Row publishers, 1974.

MLA استشهاد

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