Walker, R. J., Christopher, A. N., Wieth, M. B., & Buchanan, J. „Personality, time-of-day preference, and eating behavior: The mediational role of morning-eveningness. Personality and Individual Differences”. 77. 2015: 13—17. doi:10.1016/j.paid.2014.12.026..
Roenneberg, Till; Merrow, Martha (23. 5. 2016). „The Circadian Clock and Human Health”. Current Biology. 26 (10): R432—R443. PMID27218855. doi:10.1016/j.cub.2016.04.011.
Walker, R. J., Kribs, Z. D., Christopher, A. N., Shewach, O. R., & Wieth, M. B. „Age, the Big Five, and time-of-day preference: A mediational model. Personality and Individual Differences”. 56. 2014: 170—174. doi:10.1016/j.paid.2013.09.003..
Horne, J. A.; Östberg, O. (1976). „A self-assessment questionnaire to determine morningness-eveningness in human circadian rhythms”. Int J Chronobiol. 4 (2): 97—110. PMID1027738.
Roenneberg, Till; Merrow, Martha (23. 5. 2016). „The Circadian Clock and Human Health”. Current Biology. 26 (10): R432—R443. PMID27218855. doi:10.1016/j.cub.2016.04.011.