Gaya APA

Swanson, C, P., L., I, B, R. (NULL). Instructional product reseach . New: New York: D. VAn Nortrand; 1972.

Gaya MLA

Swanson, Carl, P.., L., I., Baker,, Robert. "Instructional product reseach". New: New York: D. VAn Nortrand; 1972, NULL. Text.