APA-referens (7:e uppl.)

Johnson, M. L. P. (1974). Thirty years with an idea. University of Alabama Press for the Organic School.

Chicago-referens (17:e uppl.)

Johnson, Marietta Louise Pierce. Thirty Years with an Idea. University: University of Alabama Press for the Organic School, 1974.

MLA-referens (9:e uppl.)

Johnson, Marietta Louise Pierce. Thirty Years with an Idea. University of Alabama Press for the Organic School, 1974.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.