(en) « Caerphilly and Speedwell collaborative heart disease studies. The Caerphilly and Speedwell Collaborative Group », Journal of Epidemiology and Community Health, vol. 38, no 3, , p. 259–262 (PMID6332166, PMCID1052363, DOI10.1136/jech.38.3.259).
(en) « Caerphilly and Speedwell collaborative heart disease studies. The Caerphilly and Speedwell Collaborative Group », Journal of Epidemiology and Community Health, vol. 38, no 3, , p. 259–262 (PMID6332166, PMCID1052363, DOI10.1136/jech.38.3.259).