Iankov, P., Andreev, L., Gerassimov, G., Ignatov, A. 1994. Spring migration of the soaring birds over Sofia plain in 1986, BAS Ecology, Sofia, 25: 14—24.
Ignatov, A., Kantrandjiev, V. 2007. Red Kite Milvus milvus. pp: 126—127, In: Iankov, P. (Ed.) Atlas of Breeding Birds in Bulgaria. Bulgarian Society for the Protection of Birds, Sofia.
Ignatov, A. 2007. Hen Harrier Circus cyaneus. pp: 142—143, In: Iankov, P. (Ed.) Atlas of Breeding Birds in Bulgaria. Bulgarian Society for the Protection of Birds, Sofia.
Ignatov, A., Georgiev, D. 2007. Long-eared Owl Asio otus. pp: 334—335, In: Iankov, P. (Ed.) Atlas of Breeding Birds in Bulgaria. Bulgarian Society for the Protection of Birds, Sofia.
Ignatov, A., Spiridonov, G., Iankov, P. 2007. Alpine Accentor Prunella collaris. pp: 422—423, In: Iankov, P. (Ed.) Atlas of Breeding Birds in Bulgaria. Bulgarian Society for the Protection of Birds, Sofia.
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The Owls of Bulgaria, ISBN 954-500-103-8
Waterbirds of Bourgas Wetlands, ISBN 954-9959-33-3
Atlas of the Breeding Birds in Bulgaria, BSPB, Conservation series, Book 10, ISBN 978-954-91421-7-4
Guide for the nature, ISBN 978-954-91790-3-3
Guide of animals and flowers included in Washington Convention — CITIES, ISBN 954-90820-8-3
Mammals of Rhodopi Mountains, ISBN 954-90601-3-6
Trees and Shrubs of National Park ‘Vitosha Mountain’
Drogflowers in Bulgaria, ISBN 954-642-117-0
Advances in Heteroptera Research, ISBN 978-954-642-311-5 (HB)
Red Data Book (insects, invertebrates, birds), in print