Longkutoy, John J.
Mutiara Sumber Widya, 1987
Buku Teks
Longkutoy, John J.
Mutiara Sumber Widya, 1985
Buku Teks
Cox, Michael J.
Boyd and Faster Pub., 1986
Buku Teks
O`Malley, Timothy J.
Tab Books, 1983
Buku Teks
Burrows, William E.
McGaw-Hill, 2003
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