Eight stage classification of human life is proposed by:

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E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 3056-3058
E6 Psychology Applied Sreevani 6e Sem1 p. 107-109
E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) p. 3368-3370
Practise the full IGNOU PB Bsc Entrance-2023
Attempt every question from this paper in a timed mock, then review the full solution for each one.