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Buku Teks
Christie, Agatha, 1890-1976, author
PT. Gramedia Pustaka Utama, 2017
Buku Teks
Bryce, Murray D., author
McGraw-Hill, 1965
Buku Teks
Delhaye, J.M.
McGraw-Hill, 1980
Buku Teks
Buchanan, James M., author
Liberty Fund, 2000
Buku Referensi