Teach yourself Esperanto,
by John Cresswell and John Hartley.
APA Citation
Cresswell, J., Hartley, J. (1957). Teach yourself Esperanto. New York: McKay .
MLA Citation
Cresswell, John, and John Hartley. Teach Yourself Esperanto. New York: McKay , 1957.
Warning: These citations may not always be complete (especially for serials).