Clifton-Mogg, Caroline, author
Pageone , 2001
Buku Referensi
Geddes-Brown, Leslie, author
Page One Publishing, 2002
Buku Referensi
Copestick, Joanna, author
Page One , 1998
Buku Referensi
A Ward Lock Book, 1997
Buku Referensi
Pile, John F., author
McGraw-Hill, 1997
Buku Teks