Cita APA (7a ed.)

Allen, S. W. (1938). An introduction to American forestry. McGraw-Hill.

Cita Chicago Style (17a ed.)

Allen, Shirley Walter. An Introduction to American Forestry. New York [etc.]: McGraw-Hill, 1938.

Cita MLA (9a ed.)

Allen, Shirley Walter. An Introduction to American Forestry. McGraw-Hill, 1938.