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	1.	Behavior modification in the natural environment / Roland G. Tharp, Ralph J. Wetzel by Tharp, Roland G, 1930- Wetzel, Ralph J Publication details: New York : Academic Press, 1969 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (6)Call number: RJ505.B4T45, ... Place hold
	2.	No cover image available Residential teaching communities : program development and staff training for developmentally disabled persons / Ralph J. Wetzel, Ronald L. Hoschouer by Wetzel, Ralph J Hoschouer, Ronald L Publication details: Texas : Scott, Foresman and Company, 1984 Availability: No items available.

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