Habitats of the WorldIain Campbell, Ken Behrens, Charley Hesse, Phil Chaon · First published 2021Open the Tome
Peterson Reference Guide to Seawatching: Eastern Waterbirds in Flight (Peterson Reference Guides)Ken Behrens, Cameron Cox · First published 2013Open the Tome
Birding Ethiopia. A guide to the country's birding sitesKen Behrens, Keith Barnes, Christian Boix, Ian Sinclair · First published 2010Open the Tome
