1. Environmental enrichment alternatives for laboratory nonhuman primates;Bayne,1989
2. Problems in justifying research on animals;Beauchamp,1985
3. Environmental enrichment for laboratory animals;Beaver;ILAR News,1989
4. Successful feeding enrichment for captive chimpanzees;Bloomsmith;Am. J. Primatol.,1988
5. Videotapes: Environmental enrichment for singly housed chimpanzees;Bloomsmith;Lab. Anim.,1990