Cita APA (7th ed.)

Checkland, P. (1981). System thinking system practice. Wiley.

Cita Chicago (17th ed.)

Checkland, Peter. System Thinking System Practice. Chichester [Sussex], New York: Wiley, 1981.

Cita MLA (9th ed.)

Checkland, Peter. System Thinking System Practice. Wiley, 1981.