APA (7th ed.) Citation

IUCN (The world conservation union), Lusty, C., Mackinven, & Oldfield, S. (1998). The world list of threatened trees. World Conservation Press..

Chicago Style (17th ed.) Citation

IUCN (The world conservation union), Charlotte Lusty, Mackinven, and Sara Oldfield. The World List of Threatened Trees. Cambridge, UK.: World Conservation Press., 1998.

MLA (9th ed.) Citation

IUCN (The world conservation union), et al. The World List of Threatened Trees. World Conservation Press., 1998.