Comstock, A. B. (1941). Handbook of nature-study QH53 .C7. Comstock Publishing.
Chicago Style aipamenaComstock, Anna Botsford. Handbook of Nature-study QH53 .C7. Ithaca, New York: Comstock Publishing, 1941.
MLA aipamenaComstock, Anna Botsford. Handbook of Nature-study QH53 .C7. Comstock Publishing, 1941.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.