Παραπομπή APA

Edward, G., & Zeller, R. A. (1979). Reliability and validity assessment. Sage.

Παραπομπή Chicago Style

Edward, G.Carmines, και Richard A. Zeller. Reliability and Validity Assessment. Newbary park: Sage, 1979.

Παραπομπή MLA

Edward, G.Carmines, και Richard A. Zeller. Reliability and Validity Assessment. Sage, 1979.