Healey Joseph F. (2012). Statistics a tool for Social Research (9th.). Cengage Learning.
Chicago-čujuhus (17. p.)Healey Joseph F. Statistics a Tool for Social Research. 9th. UK: Cengage Learning, 2012.
MLA-čujuhus (9. p.)Healey Joseph F. Statistics a Tool for Social Research. 9th. Cengage Learning, 2012.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.