Previous ed.: published as Anleitung zum Bestimmen der Familien der Blütenpflanzen. 2. Aufl. Berlin : Friedländer, 1917.
Bibliography: pxiv-xv. - Includes index.
Thonner's analytical key to the families of flowering plants by Franz Thonner. ISBN 9060214617. Published by PUDOC in 1981. Publication and catalogue information, links to buy online and reader comments.