Encyclopedieën

Handbook of the Birds of the World, Vol. 5, Barn Owls to Hummingbirds

Encyclopedieën

Handbook of the Birds of the World, Vol 8, Broadbills to Tapaculos

Encyclopedieën

Handbook of the Birds of the World, Vol. 12, Picathartes to Tits and Chickadees

Encyclopedieën

Handbook of the Birds of the World, Vol. 15, Weavers to New World Warblers