Cita APA

Gondin, W. R. 1., & Mammen, E. W. 1. (1954). The art of speaking made simple. New York, New York: Made Simple Books.

Citación estilo Chicago

Gondin, William Richard 1912-, y Edward W. 1907- Mammen. The Art of Speaking Made Simple. New York, New York: Made Simple Books, 1954.

Cita MLA

Gondin, William Richard 1912-, y Edward W. 1907- Mammen. The Art of Speaking Made Simple. New York, New York: Made Simple Books, 1954.