APA-referens (7:e uppl.)

Diettrich, S. d. [. o. c. (1961). The Philippine Islands. N. Doubleday.

Chicago-referens (17:e uppl.)

Diettrich, Sigismond deR. [from old catalog]. The Philippine Islands. Garden City, N.Y: N. Doubleday, 1961.

MLA-referens (9:e uppl.)

Diettrich, Sigismond deR. [from old catalog]. The Philippine Islands. N. Doubleday, 1961.