APA
Hurlock E. B., . (1980). Developmental psychology : A life-span approach .-5th ed. Tata mcgraw-hill publishing company limited, New Delhi: .
Chicago
Hurlock Elizabeth B, . 1980. Developmental psychology : A life-span approach .-5th ed. Tata mcgraw-hill publishing company limited, New Delhi: .
Harvard
Hurlock E. B., . (1980). Developmental psychology : A life-span approach .-5th ed. Tata mcgraw-hill publishing company limited, New Delhi: .
MLA
Hurlock Elizabeth B, . Developmental psychology : A life-span approach .-5th ed. Tata mcgraw-hill publishing company limited, New Delhi: . 1980.