Cita APA (7a ed.)

:Checkland Peter. (1999). Systems thinking, systems practice: Includes a 30-year retrospective. John Wiley.

Cita Chicago Style (17a ed.)

:Checkland Peter. Systems Thinking, Systems Practice: Includes a 30-year Retrospective. Chichester: John Wiley, 1999.

Cita MLA (9a ed.)

:Checkland Peter. Systems Thinking, Systems Practice: Includes a 30-year Retrospective. John Wiley, 1999.