Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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