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Raff, D.M.G& Summers, L.H (1987) DId Henry Ford pay efficiency wages? Journal of Labor Economics, Vol.5 NO.4 (part 2), ppS57-S86
The Efficiency Wage
O. Henry. http://www.literature-web.net/o_henry Henry, O. The World Book Encyclopedia. Volume 9. World Book Inc. 1985; pp.181.
O'Henry
Brodzinsky, D. M., & Pinderhughes, E. (2002). Parenting and child development in adoptive families. In M. Bornstein (Ed.), Handbook of parenting (2nd ed.): Vol. I. Status and social conditions of parenting. Hillsdale, NJ: Lawrence Erlbaum.
Finding Birth Parents
Henry, Matthew. "An Exposition, With Practical Observations, on the Book of Nehemiah." Matthew Henry's Commentary on the Whole Bible. 1708. Online at < http://www.ccel.org/h/henry/mhc2/MHC16000.HTM>.
"The Book of Nehemiah"
Morgan, L.H. 1871. Ancient Society: Researches in the Lines of Human Progress from Savagery, through Barbarism to Civilisation. New York: Henry York: Henry Holt.
Evolutionary Theory
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