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http://www.servicecanada.gc.ca/eng/about/reports/sin/cop/section3.shtml http://www.servicecanada.gc.ca/eng/about/reports/sin/cop/section3.shtml G. Mary Ellen, L. Dana,, R. Kathleen, R. Patricia. Business Communication: Process & Product. 4th Brief Canadian edition.Nelson Education.2013. Adapting Legal and Ethical Responsibilities. O’Sullivan, Arthur; Steven M. Sheffrin (2003). Economics: Principles in action. Upper Saddle River, New Jersey 07458: Pearson Prentice Hall. p. 29.