National Organization of Mothers of Twins Clubs, Inc. http://www.nomotc.org

Twins Magazine http://www.twinsmagazine.com/

Consumer Product Safety Commission  http://www.cpsc.gov

Elizabeth Lyons http://www.gotcrazytwins.com/

Double Up Books books for Twins, Triplets and more:   http://www.doubleupbooks.com

Family travel for families of five to eight.  http://www.sixsuitcasetravel.com/