Leedy, P., & Ormrod, J. E. (2010). Practical research: Planning and design (9th ed.). Pearson Education International.
Chicago-čujuhus (17. p.)Leedy, Paul, juo Jeanne Ellis Ormrod. Practical Research: Planning and Design. 9th ed. Upper saddle river, New Jersey: Pearson Education International, 2010.
MLA-čujuhus (9. p.)Leedy, Paul, juo Jeanne Ellis Ormrod. Practical Research: Planning and Design. 9th ed. Pearson Education International, 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.