APA aipamena

Walker Sally M. (2010). Early Bird Earth Science Soil. Lerner.

Chicago Style aipamena

Walker Sally M. Early Bird Earth Science Soil. Lerner, 2010.

MLA aipamena

Walker Sally M. Early Bird Earth Science Soil. Lerner, 2010.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.