Firth, Lesley (Patnugot Panlahat) atbp. (1985). "Cite-WWT". Who Were They? The Simon & Schuster Color Illustrated Question & Answer Book. Little Simon Book, Simon & Schuster, Inc., Lungsod ng Bagong York, ISBN 0671604767.{{cite ensiklopedya}}: CS1 maint: date auto-translated (link)