Davis, P. H., & Cullen, J. (1989). The identification of flowering plant families, including a key to those native and cultivated in north temperate regions (Third edition.). Cambridge University Press.
Chicago Style (17th ed.) CitationDavis, P. H., and J. Cullen. The Identification of Flowering Plant Families, Including a Key to Those Native and Cultivated in North Temperate Regions. Third edition. Cambridge [England] ; New York: Cambridge University Press, 1989.
MLA (9th ed.) CitationDavis, P. H., and J. Cullen. The Identification of Flowering Plant Families, Including a Key to Those Native and Cultivated in North Temperate Regions. Third edition. Cambridge University Press, 1989.
Warning: These citations may not always be 100% accurate.