APA

Petrequin G., . (1968). Individualizing learning through modular-flexible programming. New York: McGraw-Hill.

Chicago

Petrequin Gaynor, . 1968. Individualizing learning through modular-flexible programming. New York: McGraw-Hill.

Harvard

Petrequin G., . (1968). Individualizing learning through modular-flexible programming. New York: McGraw-Hill.

MLA

Petrequin Gaynor, . Individualizing learning through modular-flexible programming. New York: McGraw-Hill. 1968.