Cita APA (7a ed.)

Bertalanffy, L. v. (1973). General system theory: Foundations development applications. Penguin Books.

Cita Chicago Style (17a ed.)

Bertalanffy, Ludwig von. General System Theory: Foundations Development Applications. Harmondsworth: Penguin Books, 1973.

Cita MLA (8a ed.)

Bertalanffy, Ludwig von. General System Theory: Foundations Development Applications. Penguin Books, 1973.