Cooper, J.C., author
Thames and Hudson, 1978
Buku Referensi
Hall, James, author
John murray, 1995
Buku Referensi
Hall, James, author
John Murray, 1995
Buku Referensi
Moe, Dean, author
Augsburg Publishing House, 1985
Buku Referensi
Chishti, Amatullah Armstrong, author
Paramount Publishing Enterprise, 2005
Buku Teks