APA (7th ed.) Citation

Guba, E. G., & Lincoln, Y. S. (1989). Fourth generation evaluation. Sage.

Chicago Style (17th ed.) Citation

Guba, Egon G., and Yvonna S. Lincoln. Fourth Generation Evaluation. Newbury Park [etc.]: Sage, 1989.

MLA (9th ed.) Citation

Guba, Egon G., and Yvonna S. Lincoln. Fourth Generation Evaluation. Sage, 1989.