Ghali, A.
Chapman and Hall , 1978
Buku Teks
Ghali, A.
Intext Educational Publishers , 1972
Buku Teks
Ghali, A.
Chapman and Hall, 1978
Buku Teks
Pandit, G.S.
Tata McGraw-Hill, 1986
Buku Teks SO
Daniels, Joanne M.
Delmar Cengage Learning, 2006
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