Dixon."   Notable Black American Women , Book 1. Gale Research, 1992. Updated: 12/20/1992 Reproduced in Biography Resource Center.   Farmington Hills, Michigan :   Gale , 2009.   http://galenet.galegroup.com/servlet/BioRC , Document Number: K1623000108. Fee, via   Fairfax County Public Library   2009-04-10. ·          "Post Plays Down Impact of Endorsement;