IntestazioneRuthven, Patrick Usata in: Bibliothèque nationale de France, Paris
Fonti esterne
Trovato inBN Cat. gén. : Ruthven (Patrick), lord Ruthen. — Oxford DNB - http://www.oxforddnb.com (2009-11-25). — The Murder of Rizzio from the manuscript account / Lord Ruthven, 1890