Gale Research Inc. (1994). Encyclopedia of endangered species. Detroit: Gale Research.
Chicago Style aipamenaGale Research Inc. Encyclopedia of Endangered Species. Detroit: Gale Research, 1994.
MLA aipamenaGale Research Inc. Encyclopedia of Endangered Species. Detroit: Gale Research, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.