Tolong jelaskan mengenai Lihat pula dari Gagak banggai

(2001): Banggai Crow. In: Threatened Birds of Asia: The BirdLife International Red Data Book: 2415-2416. BirdLife International.ISBN 0-946888-44-2 HTML fulltext

(1994): Crows and jays: a guide to the crows, jays and magpies of the world. A&C Black, London.ISBN 0-7136-3999-7

(1958): Remarks on some Corvidae of Indo-Malaya and the Australian region. American Museum Novitates 1915: 1-13. PDF fulltext