Cita APA (7a ed.)

Geer, H. T. (1967). Charging systems. American Library Association.

Cita Chicago Style (17a ed.)

Geer, Helen Thornton. Charging Systems. Chicago: American Library Association, 1967.

Cita MLA (8a ed.)

Geer, Helen Thornton. Charging Systems. American Library Association, 1967.