Cita APA (7th ed.)

(1989). V. 16, № 9. 1989.

Cita Chicago (17th ed.)

V. 16, № 9. 1989, 1989.

Cita MLA (9th ed.)

V. 16, № 9. 1989, 1989.

Atenció: Aquestes cites poden no estar 100% correctes.