APA (7th ed.) Citation

Little, E. L., Woodbury, R. O., & Wadsworth, F. H. (1974). Trees of Puerto Rico and the Virgin Islands. U.S. Dept. of Agriculture, Forest Service.

Chicago Style (17th ed.) Citation

Little, Elbert L., Roy O. Woodbury, and Frank H. Wadsworth. Trees of Puerto Rico and the Virgin Islands. Washington, D.C.: U.S. Dept. of Agriculture, Forest Service, 1974.

MLA (9th ed.) Citation

Little, Elbert L., et al. Trees of Puerto Rico and the Virgin Islands. U.S. Dept. of Agriculture, Forest Service, 1974.