Cita APA

(1998). Status and trends of the Nation's Biological Resources. Fort Collins, Colorado: U.S. Departamento of the Interior, Geological Survey.

Citación estilo Chicago

Status and Trends of the Nation's Biological Resources. Fort Collins, Colorado: U.S. Departamento of the Interior, Geological Survey, 1998.

Cita MLA

Status and Trends of the Nation's Biological Resources. Fort Collins, Colorado: U.S. Departamento of the Interior, Geological Survey, 1998.