Gaya APA

Creswell, J, W. (2005). Educational Research : Planning, Conducting, and Evauating Quantitative and Qualitative Research (Ed. 2). America: Pearson Education.

Gaya MLA

Creswell, Jhon, W.. "Educational Research : Planning, Conducting, and Evauating Quantitative and Qualitative Research". Ed. 2 America: Pearson Education, 2005. Text.