APA (7th ed.) Citation

Leone, P. E. (1990). Understanding troubled and troubling youth Sage focus editions.

Chicago Style (17th ed.) Citation

Leone, Peter E. "Understanding Troubled and Troubling Youth." Sage Focus Editions 1990.

MLA (8th ed.) Citation

Leone, Peter E. "Understanding Troubled and Troubling Youth." Sage Focus Editions, 1990.

Warning: These citations may not always be 100% accurate.