HURLOCK, E. B. (1980). Development psychology: A life-span approach. Tata McGraw-Hill.
Cita Chicago (17th ed.)HURLOCK, Elizabeth B. Development Psychology: A Life-span Approach. New Delhi: Tata McGraw-Hill, 1980.
Cita MLA (9th ed.)HURLOCK, Elizabeth B. Development Psychology: A Life-span Approach. Tata McGraw-Hill, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.