«A brief history of the Speakers of the House of Commons». History Extra (på engelsk). 24. januar 2019. Besøkt 2. februar 2019. «The first Speaker, Peter de la Mare fra Herefordshire, was elected in 1376 during a constitutional crisis regarding the court and monarchy of Edward III. (…) Although the Speaker is today expected to be impartial, many previous officeholders were fiercely partisan, and until the mid-17th century they were often viewed as agents of the Crown.»
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urn.nb.no
Schreiner, Johan (1962). Middelalderen. Oslo: Aschehoug.
