APA

Little E. L., Woodbury R. O. & Wadsworth F. H. (1974). Trees of Puerto Rico and the Virgin Islands. Washington D.C., USA: U.S. Department of Agriculture.

Chicago

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

Harvard

Little E. L., Woodbury R. O. and Wadsworth F. H. (1974). Trees of Puerto Rico and the Virgin Islands. Washington D.C., USA: U.S. Department of Agriculture.

MLA

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