Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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