Gaya APA

Espich, J, E., Williams, B. (1967). Developing Programmed Instructional Materials : A Handbook for Program Writers . Belmont, California, USA: Fearon Publishers.

Gaya MLA

Espich, James, E.., Williams, Bill. "Developing Programmed Instructional Materials : A Handbook for Program Writers". Belmont, California, USA: Fearon Publishers, 1967. Academic.