U.S. Government Principles
http://grants.nih.gov/grants/olaw/references/phspol.htm#principle

Guide for the Care and Use of Laboratory Animals
http://www.nap.edu/readingroom/books/labrats/

PM 3040-2 Animal Care and Use in the Intramural Program
http://www1.od.nih.gov/oma/manualchapters/intramural/3040-2/

AAALAC
http://www.aaalac.org/