APA-referens (7:e uppl.)

Roemer, I. (1934). Our earth and its neighbors. C.C. Nelson Pub. Co..

Chicago-referens (17:e uppl.)

Roemer, Irma. Our Earth and Its Neighbors. Appleton, Wisconsin: C.C. Nelson Pub. Co., 1934.

MLA-referens (8:e uppl.)

Roemer, Irma. Our Earth and Its Neighbors. C.C. Nelson Pub. Co., 1934.