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Japan's general trading companies : Merchants of economic development
Kojima, Kiyoshi, (1984)
Japans Wirtschaft im Griff der Konglomerate : Verbundgruppen, Banken, Universalhandelshäuser
Eli, Max, (1988)
Sogo shosha : the vanguard of the Japanese economy
Yoshihara, Kunio, (1982)