APA (7th ed.) Citation

Ellis, D. O., & Ludwig, F. J. (1962). Systems philosophy. Prentice-Hall.

Chicago Style (17th ed.) Citation

Ellis, David Owen, and Fred J. Ludwig. Systems Philosophy. Englewood Cliffs, N. J: Prentice-Hall, 1962.

MLA (9th ed.) Citation

Ellis, David Owen, and Fred J. Ludwig. Systems Philosophy. Prentice-Hall, 1962.