1. Appleby, M.C. and Huertas, S.M., 2011. International issues. In: Appleby, M.C., Mench, J.A., Olsson, I.A.S. and Hughes, B.O. (eds.) Animal welfare. CAB International, Wallingford, UK, pp. 304-316.
2. Appleby, M.C., Mench, J.A., Olsson, I.A.S. and Hughes, B.O., 2011. Animal welfare. CAB International, Wallingford, UK.
3. B.O. HughesAnimal welfare
4. Broom, D.M., 2016. World impact of ISAE: past and future. In: Brown, J.A., Seddon, Y.M. and Appleby, M.C. (eds.) Animals and us – 50 years and more of applied ethology. Wageningen Academic Publishers, Wageningen, the Netherlands, pp. 269-278.