Woodburn, John H., author
Macmillan, 1965
Buku Teks
Renner, John W., author
Harper & Row, 1968
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Victor, Edward, author
Macmillan, 1966
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Jarolimek, John, author
Macmillan, 1968
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Nuzran Joher, author
Lembaga Pangkajian MPR RI, 2018
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