Cita APA (7th ed.)

Allen, B. (1996). Sprechspiegel III Lernprogramm. : IBM - International Business Machines Corporation.

Cita Chicago (17th ed.)

Allen, Barbara. Sprechspiegel III Lernprogramm. Ireland: : IBM - International Business Machines Corporation, 1996.

Cita MLA (8th ed.)

Allen, Barbara. Sprechspiegel III Lernprogramm. : IBM - International Business Machines Corporation, 1996.

Atenció: Aquestes cites poden no estar 100% correctes.