Gaya APA

}, D, B, V, D, {, E, A. (1979). Understanding educational research : an introduction (fourth edition). New York: M.cGraw-Hill Book Company.

Gaya MLA

}, Deobold, B., Van, Dalen, {, Et, Al. "Understanding educational research : an introduction". fourth edition New York: M.cGraw-Hill Book Company, 1979. Lawas.