Cita APA (7th ed.)
Foster, R. J. (1981). Freedom of simplicity. Harper & Row.
Cita Chicago (17th ed.)
Foster, Richard J. Freedom of Simplicity. San Francisco: Harper & Row, 1981.
Cita MLA (9th ed.)
Foster, Richard J. Freedom of Simplicity. Harper & Row, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.