Primula, Revised Edition, Richards, A.J. (2003).
386 pp, 84 colour photos, 111 colour illustrations, 10 b/w photos
Timber Press, Portland.
ISBN 0-88192-580-2

Timber Press review:  "This classic text has been updated and revised by the leading primulas expert. In terms of both the number of varieties grown and its popularity, Primula is one of the greatest garden genera. It is also among the largest and most widespread with approximately 430 species. This new edition includes a major taxonomic revision, information on the evolutionary history of the genus, a history of the exploration and introduction of Primula, cultivation, propagation and hybridization techniques, and a discussion of pests and diseases. This book is beautifully illustrated with over 100 drawings and photographs, including paintings by the award-winning botanical illustrator Brigid Edwards."