Beins, B. C. (2019). Research Methods (4th.). Cambridge University Press.
Chicago-čujuhus (17. p.)Beins, Bernard C. Research Methods. 4th. Cambridge University Press, 2019.
MLA-čujuhus (9. p.)Beins, Bernard C. Research Methods. 4th. Cambridge University Press, 2019.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.