APA aipamena

GUTH, H. P., & SHNIDER, P. S. (1981). Our world today. D.C. Heath.

Chicago Style aipamena

GUTH, Hans P., and Patricia S. SHNIDER. Our World Today. Lexington: D.C. Heath, 1981.

MLA aipamena

GUTH, Hans P., and Patricia S. SHNIDER. Our World Today. D.C. Heath, 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.