Cowles, Henry M. (2013). "A Victorian extinction: Alfred Newton and the evolution of animal protection". British Journal for the History of Science. 46 (4): 695–714. doi:10.1017/S0007087412000027. S2CID147260757.
Cowles, Henry M. (2013). "A Victorian extinction: Alfred Newton and the evolution of animal protection". British Journal for the History of Science. 46 (4): 695–714. doi:10.1017/S0007087412000027. S2CID147260757.