Wagenaar, T. C. (1995). Practicing social research (7th.ed.). Wadsworth.
Cita Chicago (17th ed.)Wagenaar, Theodore C. Practicing Social Research. 7th.ed. Belmont: Wadsworth, 1995.
Cita MLA (9th ed.)Wagenaar, Theodore C. Practicing Social Research. 7th.ed. Wadsworth, 1995.
Atenció: Aquestes cites poden no estar 100% correctes.