Cita APA (7th ed.)

Guttman, S. A. (1995). [S - U]. North Waterloo Academic Press.

Cita Chicago (17th ed.)

Guttman, Samuel A. [S - U]. Waterloo, Ontario: North Waterloo Academic Press, 1995.

Cita MLA (8th ed.)

Guttman, Samuel A. [S - U]. North Waterloo Academic Press, 1995.

Atenció: Aquestes cites poden no estar 100% correctes.