Thonner, F., & Geesink, R. (1981). Thonner's analytical key to the families of flowering plants. PUDOC, Centre for Agricultural Publishing and Documentation ; Leiden University Press.
Chicago Style (17th ed.) CitationThonner, Franz, and R. Geesink. Thonner's Analytical Key to the Families of Flowering Plants. Wageningen : Hague ; Boston: PUDOC, Centre for Agricultural Publishing and Documentation ; Leiden University Press, 1981.
MLA (9th ed.) CitationThonner, Franz, and R. Geesink. Thonner's Analytical Key to the Families of Flowering Plants. PUDOC, Centre for Agricultural Publishing and Documentation ; Leiden University Press, 1981.
Warning: These citations may not always be 100% accurate.