APA (7th ed.) Citation

JG, B., & TM, P. (2005). The new Clostridium difficile -- what does it mean? New England Journal of Medicine, 353(23), 2503.

Chicago Style (17th ed.) Citation

JG, Bartlett, and Perl TM. "The New Clostridium Difficile -- What Does It Mean?" New England Journal of Medicine 353, no. 23 (2005): 2503.

MLA (9th ed.) Citation

JG, Bartlett, and Perl TM. "The New Clostridium Difficile -- What Does It Mean?" New England Journal of Medicine, vol. 353, no. 23, 2005, p. 2503.