APA aipamena

Walker Sally M. Early Bird Earth Science Glaciers. Lerner.

Chicago Style aipamena

Walker Sally M. Early Bird Earth Science Glaciers. 2010 2010: Lerner.

MLA aipamena

Walker Sally M. Early Bird Earth Science Glaciers. Lerner.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.