Handbook of the Birds of Europe, the Middle East, and North Africa. Volume 2: Hawks to Bustards
Swifts : A Guide to the Swifts and Treeswifts of the World, Second edition
Illustrations by DRIESSENS, Gerald
Sunbirds: A Guide to the Sunbirds, Flowerpeckers, Spiderhunters and Sugarbirds of the World
Illustrations by Schmitt, N. John