1. Bosse, Friederike (2000): Keiretsu vor dem Aus? In: JAPAN aktuell April, S. 139–146.
2. Choi, Yongsok (2002): The Structural Transformation of the Japanese Enterprise Groups after the Economic Recession of the 1990s: The Impact of Financial Restructuring on the Keiretsu structure. In: The Post-Financial Crisis Challenges for Asian Industrialization 10, S. 749–770.
3. Deutsche Bundesbank (2004): Statistische Beihefte: Devisenstatistik, Oktober.
4. Drysdale, Peter (1995): The Question of Access to the Japanese Market. In: The Economic Record 71, September, 271–283.
5. Generalkonsulat Japans in Düsseldorf (2004): Wirtsehaftsdaten: www.emb- japan.go.jp/deutsch/wirtschaft/wirtschaft-japan/4-01-04.pdf.