APA (7th ed.) Citation

Mullen, P. (1999). Study of stalkers. The American journal of psychiatry, 156(8), 1244-1249.

Chicago Style (17th ed.) Citation

Mullen, Paul. "Study of Stalkers." The American Journal of Psychiatry 156, no. 8 (1999): 1244-1249.

MLA (9th ed.) Citation

Mullen, Paul. "Study of Stalkers." The American Journal of Psychiatry, vol. 156, no. 8, 1999, pp. 1244-1249.