P. H. Langlois, Jandle, L., Scheuerle, A., Horel, S. A., and Carozza, S. E.,
“Occurrence of conotruncal heart birth defects in Texas: a comparison of urban/rural classifications.”,
The Journal of rural health : official journal of the American Rural Health Association and the National Rural Health Care Association, vol. 26, no. 2, pp. 164-74, 2010.