Affecting the Breastfeeding/Maternal Bond 
http://www.cirp.org/library/birth/ (links to medical articles and positional papers)   

Dr. Momma compiled resources on circumcision and breastfeeding:
http://www.drmomma.org/2009/11/breastfeeding-circumcision.html
http://www.drmomma.org/2009/11/circumcision-leads-to-breastfeeding.html
http://www.drmomma.org/2009/12/effects-of-circumcision-on.html

Circumcision and Breastfeeding: Authoritative, medical citations are provided, divided by the type of disruption caused by circumcision.
http://www.circumstitions.com/Nursing.html 

Letters to La Leche League International. Leaven. Vol. 36 no. 5. October November 2000. pp. 94-95 
www.llli.org/llleaderweb/LV/LVOctNov00p94.html 

The Breastfeeding Answer Book (Third Revised Edition) by Nancy Mohrbacher, IBCLC, Julie Stock, MA, IBCLC. La Leche League International, Schaumburg, Illinois, 2003.
http://www.cirp.org/library/birth/mohrbacher1/