The genus Lewisia.
APA Citation
Mathew, B. (1989). The genus Lewisia. Kew: The Royal Botanic Gardens, Kew in association with Christopher Helm and Timber Press.
MLA Citation
Mathew, Brian. The Genus Lewisia. Kew: The Royal Botanic Gardens, Kew in association with Christopher Helm and Timber Press, 1989.
Warning: These citations may not always be complete (especially for serials).