APA

Nash III T. H., Bruce D. Ryan, Gries Corinna & Bungartz F. (2002). Lichen flora of the Greater Sonoran Desert Region. Tempe, Arizona, USA: Arizona State University.

Chicago

Nash III Thomas H, Bruce D. Ryan, Gries Corinna and Bungartz Frank. 2002. Lichen flora of the Greater Sonoran Desert Region. Tempe, Arizona, USA: Arizona State University.

Harvard

Nash III T. H., Bruce D. Ryan, Gries Corinna and Bungartz F. (2002). Lichen flora of the Greater Sonoran Desert Region. Tempe, Arizona, USA: Arizona State University.

MLA

Nash III Thomas H, Bruce D. Ryan, Gries Corinna and Bungartz Frank. Lichen flora of the Greater Sonoran Desert Region. Tempe, Arizona, USA: Arizona State University. 2002.