APA aipamena

Johnson, B., & Christensen, L. (2011). Educational research: Quantitative, qualitative, and mixed approaches (4th ed.). Sage.

Chicago Style aipamena

Johnson, Burke, and Larry Christensen. Educational Research: Quantitative, Qualitative, and Mixed Approaches. 4th ed. Los Angeles: Sage, 2011.

MLA aipamena

Johnson, Burke, and Larry Christensen. Educational Research: Quantitative, Qualitative, and Mixed Approaches. 4th ed. Sage, 2011.