Cita APA (7a ed.)

Adams, J., & Wells, S. W. (1950). Teach yourself German: A book of self-instruction in German (13th imp.). The English Universities Press.

Cita Chicago Style (17a ed.)

Adams, John, y Sydney W. Wells. Teach Yourself German: A Book of Self-instruction in German. 13th imp. London: The English Universities Press, 1950.

Cita MLA (9a ed.)

Adams, John, y Sydney W. Wells. Teach Yourself German: A Book of Self-instruction in German. 13th imp. The English Universities Press, 1950.