HOSTETLER, J. (1963). Amish Society. Baltimore: The Johns Hopkins Press .
2.
KEPHART, W. (1966). The Family, Society and the Individual. Boston: Houghton Mifflin Company .
3.
LEMBRIGHT, M. L. & YAMAMOTO, K. (1965). 'Subcultures and creative thinking: An exploratory comparison between Amish and urban American school children' , Merrill-Palmer Quarterly of Behavior and Development, 11, 49-64 .
4.
LOOMIS, C. P. (1960). Social Systems: Essays on Their Persistence and Change. Princeton, N. J.: D. Van Nostrand Company, Inc.
5.
LOOMIS, C. P. & BEEGLE, J. (1950). Rural Social Systems. New York: Prentice-Hall, Inc.
6.
ROE A. & SIEGELMAN, M. (1963). 'A parent-child relations questionnaire' , Child Development, 34, 355-369 .
7.
WALKER, H. M. & LEV, J. (1953). Statistical Inference. New York: Holt, Rinehart and Winston, Inc.
8.
WINER, B. J. (1962). Statistical Principles in Experimental Design. New York: McGraw-Hill Book Company .