Gilbert, Erik, author
Pearson Educational, 2004
Buku Teks
Europa Publications Limited, 1970
Buku Referensi
Gordon, Andrew, author
Oxford University Press, 2003
Buku Teks
Hitti, Philip K. (Philip Khuri), 1886-1978, author
MacMillan, 1974
Buku Teks
Artikel Jurnal