Cita APA (7a ed.)

Dasmann, R. (1973). A system for defining and classifyng natural regions for purposes of conservation. IUCN.

Cita Chicago Style (17a ed.)

Dasmann, R.F. A System for Defining and Classifyng Natural Regions for Purposes of Conservation. Morges, Switzerland: IUCN, 1973.

Cita MLA (9a ed.)

Dasmann, R.F. A System for Defining and Classifyng Natural Regions for Purposes of Conservation. IUCN, 1973.