APA (7th ed.) Citation

Downing, D., Clark, J., & Friedlob, G. (1988). Quantitative methods. Barron's Educational Series.

Chicago Style (17th ed.) Citation

Downing, Douglas, Jeffrey Clark, and G.Thomas Friedlob. Quantitative Methods. New York: Barron's Educational Series, 1988.

MLA (9th ed.) Citation

Downing, Douglas, et al. Quantitative Methods. Barron's Educational Series, 1988.