Encyclopedieën

Handbook of the Birds of the World, Vol. 14, Bush-shrikes to Old World Sparrows

Encyclopedieën

Handbook of the Birds of the World, Vol 11, Old World Flycatchers to Old World Warblers

Encyclopedieën

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

Encyclopedieën

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

Encyclopedieën

Handbook of the Birds of the World, Vol. 2, New World Vultures to Guineafowl