O'Connor, R. F., & Richelieu, A. J. d. P. (1912). His grey eminence: The true "Friar Joseph" of Bulwer Lytton's "Richelieu" : a historical study of the Capuchin, père Joseph Frano̜is Le Clerc du Tremblay. Dolphin Press.
Chicago-referens (17:e uppl.)O'Connor, Robert Francis, och Armand Jean du Plessis Richelieu. His Grey Eminence: The True "Friar Joseph" of Bulwer Lytton's "Richelieu" : A Historical Study of the Capuchin, Père Joseph Frano̜is Le Clerc Du Tremblay. Philadelphia: Dolphin Press, 1912.
MLA-referens (8:e uppl.)O'Connor, Robert Francis, och Armand Jean du Plessis Richelieu. His Grey Eminence: The True "Friar Joseph" of Bulwer Lytton's "Richelieu" : A Historical Study of the Capuchin, Père Joseph Frano̜is Le Clerc Du Tremblay. Dolphin Press, 1912.
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