APA (7th ed.) Citation
Buckingham, M., & Clifton, D. O. (2001). Now, discover your strengths. Pocket books.
Chicago Style (17th ed.) Citation
Buckingham, Marcus, and Donald O. Clifton. Now, Discover Your Strengths. London: Pocket books, 2001.
MLA (9th ed.) Citation
Buckingham, Marcus, and Donald O. Clifton. Now, Discover Your Strengths. Pocket books, 2001.
Warning: These citations may not always be 100% accurate.