Cita APA

Heffelfinger, J. D., Swint, E. B., Berman, S. M., & Weinstock, H. S. (2007). Trends in Primary and Secondary Syphilis Among Men Who Have Sex with Men in the United States. © American Journal of Public Health 2007.

Chicago Style Citation

Heffelfinger, James D., Emmett B. Swint, Stuart M. Berman, i Hillard S. Weinstock. Trends in Primary and Secondary Syphilis Among Men Who Have Sex With Men in the United States. © American Journal of Public Health 2007, 2007.

Cita MLA

Heffelfinger, James D., Emmett B. Swint, Stuart M. Berman, i Hillard S. Weinstock. Trends in Primary and Secondary Syphilis Among Men Who Have Sex With Men in the United States. © American Journal of Public Health 2007, 2007.