Citazione Stile APA (7a Edizione)

Espich, J. E., & Williams, B. (1967). Developing programmed instructional materials: A handbook for program writers. Lear Siegler.

Citazione stile Chigago Style (17a edizione)

Espich, James E., e Bill Williams. Developing Programmed Instructional Materials: A Handbook for Program Writers. s.l: Lear Siegler, 1967.

Citatione MLA (9a ed.)

Espich, James E., e Bill Williams. Developing Programmed Instructional Materials: A Handbook for Program Writers. Lear Siegler, 1967.