Roemer, I. (1934). Our earth and its neighbors. C.C. Nelson Pub. Co..
Chicago Style aipamenaRoemer, Irma. Our Earth and Its Neighbors. Appleton, Wisconsin: C.C. Nelson Pub. Co., 1934.
MLA aipamenaRoemer, Irma. Our Earth and Its Neighbors. C.C. Nelson Pub. Co., 1934.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.