APA (7th ed.) Citation

Porter, G. L. (1969). The nature of form in process: A principia forma. Philosophical Library.

Chicago Style (17th ed.) Citation

Porter, Gene L. The Nature of Form in Process: A Principia Forma. New York,: Philosophical Library, 1969.

MLA (8th ed.) Citation

Porter, Gene L. The Nature of Form in Process: A Principia Forma. Philosophical Library, 1969.