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Lua i Stíl Chicago (17ú heag.)ebrary, Inc, agus Andreas Opelt. Agile Contracts: Creating and Managing Successful Projects with Scrum. Hoboken, N.J.: Wiley, 2013.
Lua MLA (9ú heag.)ebrary, Inc, agus Andreas Opelt. Agile Contracts: Creating and Managing Successful Projects with Scrum. Wiley, 2013.
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