Responsive Environments Corporation, 1966
Buku Teks SO
Koelb, Clayton
Cornell University Press , 1988
Buku Teks SO
Al-Batliyusi, Abi Muhammad Abd Allah Ibn Muhammad Ibn al-Sayyid
Matba`at al-Amiriyyah, 1955
Buku Teks
Routledge, 1996
Buku Teks SO
edited by John Paynter, Tim Howell, Rchard Orton and Peter Seymour
Routledge, 1992
Buku Referensi