Guerra, C. E., Schwartz, J. S., Armstrong, K., Brown, J. S., Halbert, C. H., & Shea, J. A. (2007). Barriers of and Facilitators to Physician Recommendation of Colorectal Cancer Screening. Springer-Verlag.

Guerra, Carmen E., J. Sanford Schwartz, Katrina Armstrong, Jamin S. Brown, Chanita Hughes Halbert, und Judy A. Shea. Barriers of and Facilitators to Physician Recommendation of Colorectal Cancer Screening. Springer-Verlag, 2007.

Guerra, Carmen E., et al. Barriers of and Facilitators to Physician Recommendation of Colorectal Cancer Screening. Springer-Verlag, 2007.