Stanford, Michael
Blackwell Publishers, 1998
Buku Teks
Schlegel, Friedrich Von
Cambridge University Press, 2015
eBooks
Dray, William H.
Prentice-Hall, 1993
Buku Teks
Ibnu Khaldun
Routledge & Kegan Paul, 1958
Buku Teks
Stumpf, Samuel Enoch, 1918-1998
McGraw-Hill, 2012
Buku Teks