APA (7th ed.) Citation

Lang, G., & Heiss, G. D. (1991). A practical guide to research methods (4th ed.). University Press of America.

Chicago Style (17th ed.) Citation

Lang, Gerhard, and George D. Heiss. A Practical Guide to Research Methods. 4th ed. Lanham, Md.: University Press of America, 1991.

MLA (9th ed.) Citation

Lang, Gerhard, and George D. Heiss. A Practical Guide to Research Methods. 4th ed. University Press of America, 1991.