Eckstein, Bob. «My Search for The First Snowman». The History of the Snowman. Open Salon, 02-12-2008. Arxivat de l'original el 2010-03-04. [Consulta: 11 gener 2010].
web.archive.org
Eckstein, Bob. «My Search for The First Snowman». The History of the Snowman. Open Salon, 02-12-2008. Arxivat de l'original el 2010-03-04. [Consulta: 11 gener 2010].