APA

Pohl R. W., . (1968). How to know the grasses : pictured keys for determining the common and important american grasses with suggestions and aids for their study / Richard W. Pohl. Dubuque, Iowa: WM. C. Brown.

Chicago

Pohl Richard W, . 1968. How to know the grasses : pictured keys for determining the common and important american grasses with suggestions and aids for their study / Richard W. Pohl. Dubuque, Iowa: WM. C. Brown.

Harvard

Pohl R. W., . (1968). How to know the grasses : pictured keys for determining the common and important american grasses with suggestions and aids for their study / Richard W. Pohl. Dubuque, Iowa: WM. C. Brown.

MLA

Pohl Richard W, . How to know the grasses : pictured keys for determining the common and important american grasses with suggestions and aids for their study / Richard W. Pohl. Dubuque, Iowa: WM. C. Brown. 1968.