APA

Steen H. K., Krugman S. L., . (1998). Evolution of tropical forestry : Puerto Rico and beyond / Harold K. Steen. Washington: United States Departament of Agriculture.

Chicago

Steen Harold K, Krugman Stanley L, . 1998. Evolution of tropical forestry : Puerto Rico and beyond / Harold K. Steen. Washington: United States Departament of Agriculture.

Harvard

Steen H. K., Krugman S. L., . (1998). Evolution of tropical forestry : Puerto Rico and beyond / Harold K. Steen. Washington: United States Departament of Agriculture.

MLA

Steen Harold K, Krugman Stanley L, . Evolution of tropical forestry : Puerto Rico and beyond / Harold K. Steen. Washington: United States Departament of Agriculture. 1998.