APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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