Book

• Raphael, by Roger Jones and Nicholas Penny; Copyright Ó 1983 by Yale University.
• The World Book Encyclopedia "D" 1981 edition; Copyright Ó 1981,U.S.A. by Childcraft International Inc.
• The World Book Encyclopedia "M" 1981 edition; Copyright Ó 1981,U.S.A. by Childcraft International Inc.
• The World Book Encyclopedia "R" 1981 edition; Copyright Ó 1981,U.S.A. by Childcraft International Inc.

Other Resource

• Microsoft Encarta 96 Encyclopedia, by Microsoft; Copyright Ó 1993-1995 Microsoft Corporation.