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For case citations, texts and other lex mercatoria material on trade usages and practices:
Click TLDB's "List of Lex Mercatoria Principles".
"The parties are bound by any usages to which they have agreed and by any practice which they have established between themselves. Unless agreed otherwise, they are considered to have impliedly made applicable to their contract or its formation a usage of which the parties knew or ought to have known and which in international trade is widely known to, and regularly observed by, parties to contracts of the type involved in the particular trade concerned."
This TLDB lex mercatoria text is substantively identical to Article 9 CISG. The TLDB database provides annotations to this text. The TLDB annotations address Doctrine, Awards, Principles/Model Laws, Conventions, National Legislation.