Webb, E. T. (1981). Nonreactive measures in the social sciences (2nd ed.). Houghton Mifflin.
Chicago-čujuhus (17. p.)Webb, Eugene T. Nonreactive Measures in the Social Sciences. 2nd ed. Boston: Houghton Mifflin, 1981.
MLA-čujuhus (9. p.)Webb, Eugene T. Nonreactive Measures in the Social Sciences. 2nd ed. Houghton Mifflin, 1981.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.