Webb, J. E. Guide to living birds / J. E. Webb, J. A. Wallwork, J. H. Elgood. - London : Macmillan, 1979. - xii, 291 p. : ill. ; Includes indexes. ISBN: 0333233328 : Subjects--Topical Terms: Birds--Classification. LC Class. No.: QL677.W32 1979