Gaya APA

Wittich, W, A., Schuller, C, F. (1973). Instructional Technology its Nature and Use . Nyw York :: Harper, & Row Publishers,.

Gaya MLA

Wittich, Walter, A.., Schuller, Charles, F.. "Instructional Technology its Nature and Use". Nyw York :: Harper, & Row Publishers,, 1973. Text.