1. The use of animals in medical research and testing. Hearings before the subcommittee on science, research and technology. U.S. house of representatives,1982
2. Social attitudes and animals;Herzog,2001
3. Older Americans’ moral attitude changing Gallup Politics; August 16;Wilke,2013
4. Animal ethical evaluation: an observational study of Canadian IACUCs;Houde;Ethics Behav,2003