Hyslop, James H. (July 1895). «Animals' Rights: Considered in Relation to Social Progress by Henry S. Salt». International Journal of Ethics5 (4): 532-533. JSTOR2375563. doi:10.1086/205375.
Stephen Clark (January 1983). «Animals' Rights, Considered in Relation to Social Progress by Henry S. Salt». The Philosophical Quarterly33 (130): 98-100. JSTOR2219213. doi:10.2307/2219213.
Hyslop, James H. (July 1895). «Animals' Rights: Considered in Relation to Social Progress by Henry S. Salt». International Journal of Ethics5 (4): 532-533. JSTOR2375563. doi:10.1086/205375.
«Animals' Rights, Considered in Relation to Social Progress, etc by Henry S. Salt». The William and Mary Quarterly3 (3). January 1895. JSTOR1914789.
Stephen Clark (January 1983). «Animals' Rights, Considered in Relation to Social Progress by Henry S. Salt». The Philosophical Quarterly33 (130): 98-100. JSTOR2219213. doi:10.2307/2219213.