Cita APA

Pohl, R. (1968). How to know the graáes. Picturesd-Keys for determining the common and important American graáes with suggestions and aids for their study (Edicion revisada.). Iowa (EUA): W M Brown company publisher.

Citación estilo Chicago

Pohl, R.W. How to Know the Graáes. Picturesd-Keys for Determining the Common and Important American Graáes With Suggestions and Aids for Their Study. Edicion revisada. Iowa (EUA): W M Brown company publisher, 1968.

Cita MLA

Pohl, R.W. How to Know the Graáes. Picturesd-Keys for Determining the Common and Important American Graáes With Suggestions and Aids for Their Study. Edicion revisada. Iowa (EUA): W M Brown company publisher, 1968.