References
^ Principles of Research in Behavioral Science by Bernard E. Whitley (2001, Hardcover, Revised) ISBN 9780767421751 (revised Sep 2018)^ Whitley, Bernard E. (2015). Principles of Research in Behavioral Science, McGraw-Hill College. BiggerBooks. ISBN 9780767421751 (revised Nov 2023)^ (2013). Principles of Research in Behavioral Science ECampus. ISBN 9780767421751 (revised Jul 2015)
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