Tong, V. T., Dietz, P. M., England, L. J., Farr, S. L., Kim, S. Y., D'Angelo, D., & Bombard, J. M. (2011). Age and Racial/Ethnic Disparities in Prepregnancy Smoking Among Women Who Delivered Live Births. Centers for Disease Control and Prevention.

Tong, Van T., Patricia M. Dietz, Lucinda J. England, Sherry L. Farr, Shin Y. Kim, Denise D'Angelo, i Jennifer M. Bombard. Age and Racial/Ethnic Disparities in Prepregnancy Smoking Among Women Who Delivered Live Births. Centers for Disease Control and Prevention, 2011.

Tong, Van T., et al. Age and Racial/Ethnic Disparities in Prepregnancy Smoking Among Women Who Delivered Live Births. Centers for Disease Control and Prevention, 2011.