APA (7th ed.) Citation

Lang, G., & Heiss, G. D. (1998). A practical guide to research methods (6. ed.). Univ. Press of America.

Chicago Style (17th ed.) Citation

Lang, Gerhard, and George D. Heiss. A Practical Guide to Research Methods. 6. ed. Lanham [u.a.]: Univ. Press of America, 1998.

MLA (9th ed.) Citation

Lang, Gerhard, and George D. Heiss. A Practical Guide to Research Methods. 6. ed. Univ. Press of America, 1998.