Cerny, Walter. A field guide in color to birds / Walter Cerny ; [translated by Margot Schierlova] ; illustrated by Karel Drchal. - London : Cathay Books, c1975. - 343 p. : col. ill. ; 22 cm. Includes index. ISBN: 0904644103 : 15.00 Subjects--Topical Terms: Birds--Identification.