University of London, Institute of Historical Research. (1987). Historical Research. Basil Blackwell.
Citação do estilo Chicago (17ª ed.)University of London, Institute of Historical Research. Historical Research. Oxford, Inglaterra: Basil Blackwell, 1987.
Citação MLA (8ª ed.)University of London, Institute of Historical Research. Historical Research. Basil Blackwell, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
