edited by Lawrence Grossberg
Routledge, 1992
Buku Teks SO
editor, M.L. Stitch, Michael Bass
North-Holland, 1985
Buku Referensi
Toynbee, Arnold J.
Oxford University Press , 1948
Buku Referensi
edited by Mircea Eliade
Macmillan, 1987
Buku Referensi
Kementrian Penerangan, [date of publication not identified]
Buku Teks SO