Cita APA (7th ed.)

Shenton, J. P., & Meckler, A. M. (1973). Programmed learning aid for United States history. Learning Systems.

Cita Chicago (17th ed.)

Shenton, James Patrick, i Alan M. Meckler. Programmed Learning Aid for United States History. Homewood, IL: Learning Systems, 1973.

Cita MLA (9th ed.)

Shenton, James Patrick, i Alan M. Meckler. Programmed Learning Aid for United States History. Learning Systems, 1973.