APA

Clausen J., . (1940). Experimental studies on the nature of species. Washington, D.C: Carnegie Institution of Washington Publication.

Chicago

Clausen Jens, . 1940. Experimental studies on the nature of species. Washington, D.C: Carnegie Institution of Washington Publication.

Harvard

Clausen J., . (1940). Experimental studies on the nature of species. Washington, D.C: Carnegie Institution of Washington Publication.

MLA

Clausen Jens, . Experimental studies on the nature of species. Washington, D.C: Carnegie Institution of Washington Publication. 1940.