Cita APA (7a ed.)

Enger, F. (1957). Letters for special occasions. Mc Graw Hill.

Cita Chicago Style (17a ed.)

Enger, Frank. Letters for Special Occasions. New York: Mc Graw Hill, 1957.

Cita MLA (9a ed.)

Enger, Frank. Letters for Special Occasions. Mc Graw Hill, 1957.