Cita APA (7th ed.)

Rossi, P. H., Freeman, H. E., & Lipsey, M. W. (1999). Evaluation: A systematic approach (6th ed.). Sage.

Cita Chicago (17th ed.)

Rossi, Peter Henry, Howard E. Freeman, i Mark W. Lipsey. Evaluation: A Systematic Approach. 6th ed. Thousand Oaks, Calif: Sage, 1999.

Cita MLA (9th ed.)

Rossi, Peter Henry, et al. Evaluation: A Systematic Approach. 6th ed. Sage, 1999.