Sethi, Kevin J. A Comparison of the Pittsburgh Sleep Quality Index, a New Sleep Questionnaire, and Sleep Diaries. Denton, Texas. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc177254/. Accessed September 15, 2014.
Note: Inconsistencies in capitalization and punctuation within the Digital Library may affect this citation. Before using this citation in formal writing, please consult your preferred style manual. More information.