Cita APA

Fell, D. B., & Joseph, K. (2012). Temporal trends in the frequency of twins and higher-order multiple births in Canada and the United States. BioMed Central.

Chicago Style Citation

Fell, Deshayne B., i KS Joseph. Temporal Trends in the Frequency of Twins and Higher-order Multiple Births in Canada and the United States. BioMed Central, 2012.

Cita MLA

Fell, Deshayne B., i KS Joseph. Temporal Trends in the Frequency of Twins and Higher-order Multiple Births in Canada and the United States. BioMed Central, 2012.