APA

Gadow E. C., Paz J. E., López-Camelo J. S., Dutra M. G., Queenan J. T., Simpson J. L., Jennings V. H. & Castilla E. E. (19981117). Unintended pregnancies in women delivering at 18 South American hospitals. NFP-ECLAMC Group. Latin American Collaborative Study of Congenital Malformations. : Human reproduction (Oxford, England).

Chicago

Gadow E C, Paz J E, López-Camelo J S, Dutra M G, Queenan J T, Simpson J L, Jennings V H and Castilla E E. 19981117. Unintended pregnancies in women delivering at 18 South American hospitals. NFP-ECLAMC Group. Latin American Collaborative Study of Congenital Malformations. : Human reproduction (Oxford, England).

Harvard

Gadow E. C., Paz J. E., López-Camelo J. S., Dutra M. G., Queenan J. T., Simpson J. L., Jennings V. H. and Castilla E. E. (19981117). Unintended pregnancies in women delivering at 18 South American hospitals. NFP-ECLAMC Group. Latin American Collaborative Study of Congenital Malformations. : Human reproduction (Oxford, England).

MLA

Gadow E C, Paz J E, López-Camelo J S, Dutra M G, Queenan J T, Simpson J L, Jennings V H and Castilla E E. Unintended pregnancies in women delivering at 18 South American hospitals. NFP-ECLAMC Group. Latin American Collaborative Study of Congenital Malformations. : Human reproduction (Oxford, England). 19981117.