Periplus, 2004
Buku Teks SO
Foreign languages press, 1962
Buku Teks SO
Johnson, J.
Allical Publishers Private , 1963
Buku Teks
edited by Larry W. Bowman and Ian Clark
Westview Press, 1981
Buku Teks SO
Jhunjhunwala, Bharat
Kalpaz Publications, 2008
Buku Teks SO