Who classified personality as extrovert and introvert?

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E6 Psychology Applied Sreevani 6e Sem1 p. 101-103
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 3171-3173
Practise the full RUHS, Jaipur, M.Sc Nursing Entrance Exam-2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.