C. S. Hammond and Company
C.S. Hammond & Co., [date of publication not identified]
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R.M. Soetardjo Soerjosumarno
Pembimbing, 1962
Buku Teks
C.S. Hammond , 1961
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C.S. Hammond & Co. , 1960
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Encyclopaedia Britannica, 1989
Buku Referensi