World Book, Inc. Staff.

The 1996 World Book Year Book : Supplement to the World Book Encyclopedia

The 1997 World Book Year Book : Supplement to the World Book Encyclopedia

The 1998 World Book Year Book : Supplement to the World Book Encyclopedia

The 1999 World Book Year Book : Supplement to the World Book Encyclopedia

The 2000 World Book Year Book : Supplement to the World Book Encyclopedia

The 2001 World Book Year Book : Supplement to the World Book Encyclopedia

The 2004 World Book Year Book : Supplement to the World Book Encyclopedia

The 2005 World Book Year Book : Supplement to the World Book Encyclopedia

The 2006 World Book Year Book : Supplement to the World Book Encyclopedia

The 2007 World Book Year Book : Supplement to the World Book Encyclopedia