Lessler, J. T. K. (1992). Nonsampling errors in survys. John Wiley.
Chicago Style aipamenaLessler, Judith T Kalsbeek. Nonsampling Errors in Survys. New ork: John Wiley, 1992.
MLA aipamenaLessler, Judith T Kalsbeek. Nonsampling Errors in Survys. John Wiley, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.