Gaya APA
Creswell, J, W. (2017).
Research Design : Pendekatan kualitatif, kuantitatif, dam mixed (3. cet.6).
Yogyakarta:
Pustaka pelajar.
Gaya MLA
Creswell, John, W..
"Research Design : Pendekatan kualitatif, kuantitatif, dam mixed".
3. cet.6
Yogyakarta:
Pustaka pelajar,
2017.
Text.