APA-referens (7:e uppl.)

Petrou, S., Mehta, Z., Hockley, C., Cook-Mozaffari, P., Henderson, J., & Goldacre, M. (2003). The impact of preterm birth on hospital inpatient admissions and costs during the first 5 years of life.

Chicago-referens (17:e uppl.)

Petrou, S., Z. Mehta, C. Hockley, P. Cook-Mozaffari, J. Henderson, och M. Goldacre. The Impact of Preterm Birth on Hospital Inpatient Admissions and Costs During the First 5 Years of Life. 2003.

MLA-referens (9:e uppl.)

Petrou, S., et al. The Impact of Preterm Birth on Hospital Inpatient Admissions and Costs During the First 5 Years of Life. 2003.