Keating, Sarah B
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Buku Teks
edited by Jane G. Zapka
Third Party Publishing, 1982
Buku Teks
Packer, Herbert L.
McGraw-Hill, 1973
Buku Teks
edited by Davis S. Miall
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Institute for Scientific co-coperation, [date of publication not identified]
Majalah, Jurnal, Buletin