Gaya APA

Creswell, J, W. (2012). Educational Research : Planning, Conducting, and Evaluating Quantitative and Qualitative Research (4th ed). Boston: Pearson Education International.

Gaya MLA

Creswell, John, W.. "Educational Research : Planning, Conducting, and Evaluating Quantitative and Qualitative Research". 4th ed Boston: Pearson Education International, 2012. MP.