Dirk Hebel & Jörg Stollmann (eds.) (2005) Bathroom Unplugged: Architecture and Intimacy (German/English dual language edition) Bad ohne Zimmer: Architektur und Intimität - Birkhäuser, Basel ISBN 3-7643-7232-X
Teresi, Dick; et al. (2002). Lost Discoveries: The Ancient Roots of Modern Science--from the Babylonians to the Maya. New York: Simon & Schuster. pp. 351–352. ISBN 0-684-83718-8.