Cita APA (7th ed.)

Himstreet, W. C., & Baty, W. M. (1976). Programmed learning aid for business communications. Learning Systems Co.

Cita Chicago (17th ed.)

Himstreet, William C., i Wayne Murlin Baty. Programmed Learning Aid for Business Communications. Homewood, Ill: Learning Systems Co, 1976.

Cita MLA (9th ed.)

Himstreet, William C., i Wayne Murlin Baty. Programmed Learning Aid for Business Communications. Learning Systems Co, 1976.