U.S. Department of Agriculture, Food and Nutrition Service, Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) – Loving Support Makes Breastfeeding Work Materials (1–3) on WIC works
http://www.nal.usda.gov/wicworks/Learning_Center/support_materials.html#pamphlets

“Busy Moms: Breastfeeding Works Around My Schedule”
http://www.nal.usda.gov/wicworks/Learning_Center/LS/pamphlets/Busy_Moms.pdf

Abstract
Returning to work or school and continuing to breastfeed can present many challenges, however several strategies are suggested to help breastfeeding women develop an effective plan for continuing to breastfeed. Pregnant and breastfeeding women receive useful information about breastfeeding and returning to work or school.