APA

Saettler L. P., . (19671968). A history of instructional technology. New York: McGraw-Hill.

Chicago

Saettler L Paul, . 19671968. A history of instructional technology. New York: McGraw-Hill.

Harvard

Saettler L. P., . (19671968). A history of instructional technology. New York: McGraw-Hill.

MLA

Saettler L Paul, . A history of instructional technology. New York: McGraw-Hill. 19671968.