Rao, B. V.
terling Publishers Private, 1984
Buku Teks
Revill, J.C.
Longmans, 1959
Buku Teks
Juvaini, Ala-ad-Din Ata-Malik, author
Manchester University Press, 1958
Buku Teks
Smart, Terry L., author
Holt, Reinhart and Winston, 1987
Buku Teks
Johnson, Elmer D., author
The Scarecrow Press, 1970
Buku Teks