APA استشهاد

Ellis, D. O. (1962). Systems philosophy. Prentice-Hall of India.

استشهاد بنمط شيكاغو

Ellis, David O. Systems Philosophy. New Jersey: Prentice-Hall of India, 1962.

MLA استشهاد

Ellis, David O. Systems Philosophy. Prentice-Hall of India, 1962.