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References
Berk, L. E. (2007). Development through the lifespan (4th ed.): Pearson Education, Inc.
Goldhaber, D. E. (2000). Theories of human development: Integrative perspectives. Mountain View: Mayfield Publishing Company.
Labouvie-Vief, G. (1980). Beyond formal operations: Uses and limits of pure logic in life-span development. Human Development, 23, 141–161.
Merriam, S. B., Caffarella, R. S., & Baumgartner, L. M. (2007). Learning in adulthood (3rd ed.). San Francisco: Jossey-Bass.
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