Adrian Guelke: The Political Impasse in South Africa and Northern Ireland: A Comparative Perspective. I Comparative Politics Vol. 23, No. 2 (jan. 1991), s. 143. Elektronisk frå https://www.jstor.org/stable/422358?seq=1#page_scan_tab_contents Lese 3. august 2019.
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Civil Authorities (Special Powers) Act (Northern Ireland) 1922 i digital fullversjon frå Conflict Archive in the Internet (CAIN): https://cain.ulster.ac.uk/hmso/spa1922.htm Henta 3. august 2019.