توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Ohuma, E., Papageorghiou, A., Villar, J., & Altman, D. (2013). Estimation of gestational age in early pregnancy from crown-rump length when gestational age range is truncated: The case study of the INTERGROWTH-21st Project. BioMed Central.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Ohuma, E., A. Papageorghiou, J. Villar, و D. Altman. Estimation of Gestational Age in Early Pregnancy from Crown-rump Length When Gestational Age Range Is Truncated: The Case Study of the INTERGROWTH-21st Project. BioMed Central, 2013.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Ohuma, E., et al. Estimation of Gestational Age in Early Pregnancy from Crown-rump Length When Gestational Age Range Is Truncated: The Case Study of the INTERGROWTH-21st Project. BioMed Central, 2013.