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Duffy, JF; Czeisler, CA (2002). "Age-Related Change in the Relationship Between Circadian Period, Circadian Phase, and Diurnal Preference in Humans". Neuroscience Letters. 318 (3): 117–120. doi:10.1016/S0304-3940(01)02427-2. PMID11803113. S2CID43152568.
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Patrzek, J.; Sattler, S.; van Veen, F.; Grunschel, C.; Fries, S. (2014). "Investigating the Effect of Academic Procrastination on the Frequency and Variety of Academic Misconduct: A Panel Study". Studies in Higher Education. 40 (6): 1–16. doi:10.1080/03075079.2013.854765. S2CID144324180.
Tuckman, Bruce W. (1991). "The Development and Concurrent Validity of the Procrastination Scale". Educational and Psychological Measurement. 51 (2). SAGE Publications: 473–480. doi:10.1177/0013164491512022. ISSN0013-1644. S2CID145707625.