edited by S.J. De Leat, A.H. Dani, J.L. Lorenzo and R.B. Nunoo
Routledge , 1994
Buku Referensi
Brinton, Crane, 1898-1968
Prentice-Hall, 1960
Buku Teks SO
Wallbank, T. Walter
Scott, Foresman, 1965
Buku Teks SO
Needham, Joseph
Cambridge University Press, 1956
Buku Teks SO
Reilly, Kevin
Harper and Row, c1980
Buku Teks SO