بريطانيا خلال الحرب العالمية الأولى: الفرق بين النسختين

* [https://web.archive.org/web/20170202072214/https://www.sheffield.gov.uk/libraries/archives-and-local-studies/research-guides/world-war-one.html Sheffield City Council Libraries and Archives: "Sources for the Study of World War I in Sheffield" website] — ''research guide links''.