McGovern, John
Prentice Hall International, 1987
Buku Teks
Bruce, Kenneth C.
Longmans, 1966
Buku Teks
compiled and translated by Ismail Mazhar
The Renaissance Bookshop, 1950
Buku Referensi
McKay, William R.
Pearson Education , 2011
Buku Teks
McCullagh, Marie
Cambridge University Press, 2008
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