Gaya APA
Neumen, W, L. (1997).
Social Research Methods Qualitative and quantitative approaches .
Boston:
Boston: Allyn and Bacon; 1997.
Gaya MLA
Neumen, W., Lawrence.
"Social Research Methods Qualitative and quantitative approaches".
Boston:
Boston: Allyn and Bacon; 1997,
1997.
Text.