Brinig, Margaret F. Rings and Promises(PDF). The Journal of Law, Economics, and Organization. Spring 1990, 6 (1): 203–215 [2014-01-04]. (原始内容存档(PDF)于2013-12-28).
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Brinig, Margaret F. Rings and Promises(PDF). The Journal of Law, Economics, and Organization. Spring 1990, 6 (1): 203–215 [2014-01-04]. (原始内容存档(PDF)于2013-12-28).