(2003). Survey research: The basics / Keith F. Punch.
Chicago-čujuhus (17. p.)Survey Research: The Basics / Keith F. Punch. 2003.
MLA-čujuhus (9. p.)Survey Research: The Basics / Keith F. Punch. 2003.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.