Spence, R. (1 January 1957). "Chemical Process Development for Widscale". Journal of the Royal Institute of Chemistry. 81 (May): 361. doi:10.1039/JI9578100353. ISSN0368-3958.
Rose, John Donald (1 December 1974). "Ronald Holroyd, 1904 - 1973". Biographical Memoirs of Fellows of the Royal Society. 20: 235–245. doi:10.1098/rsbm.1974.0010. S2CID58635851.
Rose, John Donald (1 December 1974). "Ronald Holroyd, 1904 - 1973". Biographical Memoirs of Fellows of the Royal Society. 20: 235–245. doi:10.1098/rsbm.1974.0010. S2CID58635851.
Spence, R. (1 January 1957). "Chemical Process Development for Widscale". Journal of the Royal Institute of Chemistry. 81 (May): 361. doi:10.1039/JI9578100353. ISSN0368-3958.