APA (7th ed.) Citation

Walmsley, R. (1999). World prison population list. Research findings, 88, 1-6.

Chicago Style (17th ed.) Citation

Walmsley, Roy. "World Prison Population List." Research Findings 88 (1999): 1-6.

MLA (9th ed.) Citation

Walmsley, Roy. "World Prison Population List." Research Findings, vol. 88, 1999, pp. 1-6.