Gaya APA

Creswell, J, W., GUETTERMAN, T, C. (2021). EDUCATIONL RESEARCH : PLANNING, CONDUCTING, AND EVALUATING QUANTITATIVE AND QUALITATIVE RESEARCH SIXTH EDITION (ED. 6). UNITED KINGOM: PEARSO EDUCATION LIMITED.

Gaya MLA

Creswell, John, W.., GUETTERMAN, TIMOTHY, C.. "EDUCATIONL RESEARCH : PLANNING, CONDUCTING, AND EVALUATING QUANTITATIVE AND QUALITATIVE RESEARCH SIXTH EDITION". ED. 6 UNITED KINGOM: PEARSO EDUCATION LIMITED, 2021. Text.