APA (7th ed.) Citation

Guptill, A. L. (1936). Sketching as a hobby. Harper & brothers.

Chicago Style (17th ed.) Citation

Guptill, Arthur L. Sketching as a Hobby. New York London: Harper & brothers, 1936.

MLA (9th ed.) Citation

Guptill, Arthur L. Sketching as a Hobby. Harper & brothers, 1936.