APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.