1. U.S. Census Bureau State median income http://www.mdac.us/wp-content/uploads/2011/02/MOHP-Dental-Action-r4.pdf
2. Maryland Dental Action Coalition Maryland oral health plan 2011-2015 http://www.dhmh.state.md.us/pressreleases/pdf/2011/MOHP_Dental-Action_Plan_0511.pdf
3. The Pew Center on the States The state of children's dental health: making coverage matter http://www.pewcenteronthestates.org/uploadedFiles/The_State_of_Children's_Dental_health.pdf