APA Citatie

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

Chicago Style citaat

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

MLA citatie

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