Kost, K., Singh, S., Vaughan, B., Trussell, J., & Bankole, A. (2007). Estimates of contraceptive failure from the 2002 National Survey of Family Growth.

Kost, Kathryn, Susheela Singh, Barbara Vaughan, James Trussell, και Akinrinola Bankole. Estimates of Contraceptive Failure From the 2002 National Survey of Family Growth. 2007.

Kost, Kathryn, et al. Estimates of Contraceptive Failure From the 2002 National Survey of Family Growth. 2007.