Walrus. [s.n.].
Chicago Style aipamenaWalrus. Champaign, Ill.: [s.n.].
MLA aipamenaWalrus. [s.n.].
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
Walrus. [s.n.].
Chicago Style aipamenaWalrus. Champaign, Ill.: [s.n.].
MLA aipamenaWalrus. [s.n.].