Gaya APA
Bogdan, R, C., Biklen, S, K. ().
Qualitative Research for Education: an introduction to theory and methods .
1982:
.
Gaya MLA
Bogdan, Robert, C.., Biklen, Sari, Knopp.
"Qualitative Research for Education: an introduction to theory and methods".
1982:
,
.
Text.