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APA Citation Guide from Purdue Online Writing Lab (OWL)
The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material, and provide these as a free service of the Writing Lab at Purdue.
Harvard Business School Citation Guide
The guide has been adapted from Chapter 3 of the Style Guide for HBS Casewriters, which is available online at http://intranet.hbs.edu/dept/drfd/caseservices/styleguide.pdf. The core of the Style Guide is based on The Chicago Manual of Style. Whichever method you choose, it is important to follow a format that is clear and consistent.