APA (7th ed.) Citation

Forrester, J. W. (1990). Principles of systems. Pegasus Communications.

Chicago Style (17th ed.) Citation

Forrester, Jay Wright. Principles of Systems. Waltham, Mass.: Pegasus Communications, 1990.

MLA (9th ed.) Citation

Forrester, Jay Wright. Principles of Systems. Pegasus Communications, 1990.