Mather, Hal
McGraw-Hill, 1984
Buku Teks SO
Pilyar, Yuri
Foreign Languages Publishing House, [date of publication not identified]
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Dewie Sekar
Gramedia Pustaka Utama , 2019
Buku Teks SO
Artikel Jurnal
Cochrane, Susan H.
Johns Hopkins University Press, 1979
Buku Teks SO