APA

World Wildlife Fund, . (2003). A resource guide to terrestrial conservation planning at thee regional scale. Estados Unidos: World Wildlife Fund.

Chicago

World Wildlife Fund, . 2003. A resource guide to terrestrial conservation planning at thee regional scale. Estados Unidos: World Wildlife Fund.

Harvard

World Wildlife Fund, . (2003). A resource guide to terrestrial conservation planning at thee regional scale. Estados Unidos: World Wildlife Fund.

MLA

World Wildlife Fund, . A resource guide to terrestrial conservation planning at thee regional scale. Estados Unidos: World Wildlife Fund. 2003.