(1993). Experimental design and methods. Sage.
Chicago-čujuhus (17. p.)Experimental Design and Methods. London: Sage, 1993.
MLA-čujuhus (9. p.)Experimental Design and Methods. Sage, 1993.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.