• 21
    Nitchū Keizai Kyōkai.
    Tokyo : Dōkai, 1975.
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  • 22
    Nitchū Keizai Kyōkai
    Tōkyō : Nitchū Keizai Kyōkai, 1978.
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  • 23
    Tōkyō : Nitchū Keizai Kyōikai, 1984.
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