Cita APA (7a ed.)

Pilsbry, H. A. (1939). Land molluska of North America. Wickersham Printing.

Cita Chicago Style (17a ed.)

Pilsbry, Henry Augustus. Land Molluska of North America. Philadelphia: Wickersham Printing, 1939.

Cita MLA (9a ed.)

Pilsbry, Henry Augustus. Land Molluska of North America. Wickersham Printing, 1939.