Gaya APA

Gall, M, D., Borg, M, D, G, J, P, G, W, R. (2003). Educational research an introduction (Seventh edition). Boston: Pearson Education, Inc.

Gaya MLA

Gall, Meredith, D.., Borg, Meredith, D., Gall,, Joyce, P., Gall,, Walter, R.. "Educational research an introduction". Seventh edition Boston: Pearson Education, Inc, 2003. Text.