- Stevens, Christine7
- Animal Welfare Institute6
- Society for Animal Protective Legislation6
- Royal Society for the Prevention of Cruelty to Animals5
- National Anti-steel-trap League4
- Universities Federation for Animal Welfare4
- University of London. Animal Welfare Society3
- United States. Congress2
- United States. Department of Agriculture2
- Aristotle1
- Cigman, Ruth, 1951-1
- Clinton, Bill, 1946-1
- Cohen, Carl, 1931-1
- Darwin, Charles, 1809-18821
- Dowding, Muriel Dowding, Baroness1
- Frey, R. G. (Raymond Gillespie)1
- Hume, David, 1711-17761
- Rawls, John, 1921-20021
- Rowley, Francis H. (Francis Harold), 1854-1
- Singer, Peter, 1946-1