edited by A.H. Dani and J.P. Mohen
Routledge , 1996
Buku Referensi
edited by John Henry Raleigh
Holt, Rinehart and Winston, 1962
Buku Teks
Webster, Hutton, author
D.C. Heath, 1947
Buku Teks
Burns, Edward McNall, 1897-1972, author
W.W. Norton & Company, 1973
Buku Teks
Huntington, Samuel P., author
Simon & Schuster, c1996
Buku Teks