Cita APA

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

Citación estilo Chicago

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

Cita MLA

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