Gaya APA

Creswell, J, W. (2012). Educational Research: Planning, conducting and evaluating quantitative and qualitative research (Cetakan 4). : Pearson Education, Inc.

Gaya MLA

Creswell, John, W.. "Educational Research: Planning, conducting and evaluating quantitative and qualitative research". Cetakan 4 : Pearson Education, Inc, 2012. Text.