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2. Uit het level der Neushoornvogels, I, II, III. [From the life of hornbills];Bartels;Trop. Nat.,1937
3. Uit het level der Neushoornvogels, I, II, III. [From the life of hornbills];Bartels;Trop. Nat.,1937
4. Uit het level der Neushoornvogels, I, II, III. [From the life of hornbills];Bartels;Trop. Nat.,1937
5. A conservation management study of wildlife hunting in Sabah and Sarawak: report on the completion of fieldwork;Bennett,1995