Patterson, E. W. (1957). Cases and materials on contracts II (4th ed.). The Foundation Press, Inc.
Lua i Stíl Chicago (17ú heag.)Patterson, Edwin Wilhite. Cases and Materials on Contracts II. 4th ed. Chicago: The Foundation Press, Inc, 1957.
Lua MLA (9ú heag.)Patterson, Edwin Wilhite. Cases and Materials on Contracts II. 4th ed. The Foundation Press, Inc, 1957.
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