Gaya APA

JOHNSON, S, R., JOHNSON, R, B. (1972). Developing individualized instructional material: (5th ed.). California: Westinghouse Learning Press.

Gaya MLA

JOHNSON, Stuart, R.., JOHNSON, Rita, B.. "Developing individualized instructional material:". 5th ed. California: Westinghouse Learning Press, 1972. Buku.