edited by Oren Ergas and Sharon Todd.
Blackwell, 2016
Buku Teks
Chung-Ying Cheng, Eric Nelson, and Linyu Gu.
John Wiley , 2013
Buku Teks
Blackwell Publishing, 2007
Buku Teks
edited by Noel Entwistle
Routledge, 1990
Buku Referensi
Saiyidain, K.G.
Shaikh Muhammad Ashraf, 1954
Buku Teks SO