Gaya APA
NEUMAN, W, L. (1999).
Social Research Methods Qualitative And Quantitative Approaches (Fourth Ed).
boston:
Allyn & Bacon.
Gaya MLA
NEUMAN, W., Lawrence.
"Social Research Methods Qualitative And Quantitative Approaches".
Fourth Ed
boston:
Allyn & Bacon,
1999.
UMUM.