Neugarten، B.L.، Havighurst، R.J. & Tobin، S.S. Personality and Pattern of Aging. In: Neugarten، B.L، "Ed."، ١٩٦٨.

Neugarten، B.L.، Moore، J.W. & Lowe، J.C. Age Norms، Age Constraints and Adult Socialization. Am. J. Sociology، ١٩٦٥،٧٠،٧١٠-٧١٧.

Neugarten، B.L. & Weirslein، K.K. The Changing American

Grandperent. J. of Marriage & Family، ١٩٦٤، ٢٦،١٩٩-٢٠٥.

Nisbet، J.D. Intelligence and Age: Retesting with Twenty-four Years Interval. Brit. J. Educ. Psychol.، ١٩٥٧،٢٧، ١٩٠-١٩٨.

Organization For Economic Co-operation and Development "OECD". Learning Opportunities For Adults، vol. ٣، Paris: OECD، ١٩٧٩.

OECD & CER١ Centre For Educational Research and Innovation". Recurrent Education: A Strategy For Lifelong Learning Paris. OECD، ١٩٧٣.

Osofsky، J.D. "Ed." Handbook of Infant Development. New York: John Wiley، ١٩٨٧.

Papalia، D.E. The Status of Several Conservation Abilities Across the Life-span. Human Develop.، ١٩٧٢، ١٥،٢٢٩-٢٤٣.

Papalia، D.E. & Bielby، D. Cognitive Functioning in Middle and Old-Age Adults: A Review of Research based on Piagct's Theory. Human Develop.، ١٩٧٤، ١٧،٤٢٤-٤٤٣.

Parlmutter، M. & Hall، E. Adult Development and Aging. New York: John Wiley، ١٩٨٥.

Pcrsaud، T. V. N. & Zindani، A. M. After the Forty-second Day of Intrauterine Life. Cairo: ١st Conference of Islamic Medicine، ١٩٨٥.