Παραπομπή APA

Paul Vogt W. (2011). Sage quantitative research methods (vol.2). Sage.

Παραπομπή Chicago Style

Paul Vogt W. Sage Quantitative Research Methods (vol.2). New Delhi: Sage, 2011.

Παραπομπή MLA

Paul Vogt W. Sage Quantitative Research Methods (vol.2). Sage, 2011.