APA (7th ed.) Citation

Walmsley, R., & Joutsen, M. (1998). Prison populations in Europe and North America: Problems and solutions. Penological information bulletin, 21, 104-112.

Chicago Style (17th ed.) Citation

Walmsley, Roy, and Matti Joutsen. "Prison Populations in Europe and North America: Problems and Solutions." Penological Information Bulletin 21 (1998): 104-112.

MLA (8th ed.) Citation

Walmsley, Roy, and Matti Joutsen. "Prison Populations in Europe and North America: Problems and Solutions." Penological Information Bulletin, vol. 21, 1998, pp. 104-112.