Gaya APA
Borg, W, R., Gall, M, D.
(1983).
Educational research an introduction
(
Ed. 4)
.
New York:
Longman.
Gaya MLA
Borg, Walter, R., Gall, Meredith, Damien.
"Educational research an introduction".
Ed. 4
New York:
Longman,
1983.
Text.