Barrett, N. [. (1975). Purnell's illustrated nature atlas. Purmell.
Chicago Style aipamenaBarrett, Norman [ed.]. Purnell's Illustrated Nature Atlas. Berkshire: Purmell, 1975.
MLA aipamenaBarrett, Norman [ed.]. Purnell's Illustrated Nature Atlas. Purmell, 1975.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.