Davis, P. H., & Cullen, J. (1989). The identification of flowering plant families : including a key to those native and cultivated in North temperate regions / P.H. Davis, J. Cullen: Including a key to those native and cultivated in North temperate regions (3rd ed.). 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 / P.H. Davis, J. Cullen: Including a Key to Those Native and Cultivated in North Temperate Regions. 3rd ed. Cambridge: 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 / P.H. Davis, J. Cullen: Including a Key to Those Native and Cultivated in North Temperate Regions. 3rd ed. Cambridge University Press, 1989.