APA استشهاد

Director, S. W., & Rohrer, R. A. (1972). Introduction to systems theory. Mc Graw - Hill.

استشهاد بنمط شيكاغو

Director, Stephen W., و Ronald A. Rohrer. Introduction to Systems Theory. New Delhi: Mc Graw - Hill, 1972.

MLA استشهاد

Director, Stephen W., و Ronald A. Rohrer. Introduction to Systems Theory. Mc Graw - Hill, 1972.