Cita APA (7th ed.)

(1971). Vol. 26, № 9. 1971.

Cita Chicago (17th ed.)

Vol. 26, № 9. 1971, 1971.

Cita MLA (9th ed.)

Vol. 26, № 9. 1971, 1971.

Atenció: Aquestes cites poden no estar 100% correctes.