WALLIMAN NICHOL. (2012). YOUR RESEARCH PROJECT (3rd.). Sage.
Chicago Style aipamenaWALLIMAN NICHOL. YOUR RESEARCH PROJECT. 3rd. New Dehli: Sage, 2012.
MLA aipamenaWALLIMAN NICHOL. YOUR RESEARCH PROJECT. 3rd. Sage, 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.