BlakeM. J. F. (1967) Relationships between circadian rhythm of body temperature and introversion-extraversion. Nature, 215, 896–897.
2.
ColquhounW. P.CorcoranD. W. J. (1964) The effects of time of day and social isolation on the relationship between temperament and performance. British Journal of Social and Clinical Psychology, 3, 226–231.
3.
EysenckH. J. (1962) The Maudsley Personality Inventory. San Diego, CA: Educational & Industrial Testing Service.
4.
EysenckH. J. (1967) The biological basis of personality. Springfield, IL: Thomas.
5.
HorneJ. A.ÖstbergO. (1976) A self-assessment questionnaire to determine morningness-eveningness. International Journal of Chronbiology, 4, 97–110.
6.
HorneJ. A.ÖstbergO. (1977) Individual differences in human circadian rhythms. Biological Psychology, 5, 179–190.
7.
LevyD. A. (1985) Optimism and pessimism: Relationships to circadian rhythms. Psychological Reports, 57, 1123–1126.
8.
WebbW. B.BonnetM. H. (1978) The sleep of ‘morning’ and ‘evening’ types. Biological Psychology, 7, 29–35.