Cita APA (7a ed.)

O'Leary, Z. (2004). The Essential guide to doing research (Repr. of the 1st ed. of 2004.). Sage.

Cita Chicago Style (17a ed.)

O'Leary, Zina. The Essential Guide to Doing Research. Repr. of the 1st ed. of 2004. London [etc.]: Sage, 2004.

Cita MLA (9a ed.)

O'Leary, Zina. The Essential Guide to Doing Research. Repr. of the 1st ed. of 2004. Sage, 2004.