WRIGHT, Chester W.. The Economic Development of France and Germany, 1815 – 1914. J. H. Clapham. Journal of Political Economy, 1938-02, roč. 46, čís. 1, s. 134–134. Dostupné online [cit. 2020-05-13]. ISSN0022-3808. DOI: 10.1086/255185.
HEYWOOD, S.. 'The Apostolate of the Pen': MGR De Segur and the Mobilization of Catholic Opinion in Second Empire France. French History, 2012-04-17, roč. 26, čís. 2, s. 203–221. Dostupné online [cit. 2020-05-24]. ISSN0269-1191. DOI: 10.1093/fh/crs010.
HEYWOOD, S.. 'The Apostolate of the Pen': MGR De Segur and the Mobilization of Catholic Opinion in Second Empire France. French History, 2012-04-17, roč. 26, čís. 2, s. 203–221. Dostupné online [cit. 2020-05-24]. ISSN0269-1191. DOI: 10.1093/fh/crs010.
PAYNE, Howard C.. Theory and Practice of Political Police during the Second Empire in France. The Journal of Modern History, 1958-03, roč. 30, čís. 1, s. 14–23. Dostupné online [cit. 2020-05-24]. ISSN0022-2801. DOI: 10.1086/238159.
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PRICE, Roger. Documents on the Second French Empire, 1852-1870. [s.l.] : Palgrave, 2015-07-20. Google-Books-ID: FJpMDwAAQBAJ. Dostupné online.ISBN 978-1-137-50734-1. (po anglicky)
WRIGHT, Chester W.. The Economic Development of France and Germany, 1815 – 1914. J. H. Clapham. Journal of Political Economy, 1938-02, roč. 46, čís. 1, s. 134–134. Dostupné online [cit. 2020-05-13]. ISSN0022-3808. DOI: 10.1086/255185.
HEYWOOD, S.. 'The Apostolate of the Pen': MGR De Segur and the Mobilization of Catholic Opinion in Second Empire France. French History, 2012-04-17, roč. 26, čís. 2, s. 203–221. Dostupné online [cit. 2020-05-24]. ISSN0269-1191. DOI: 10.1093/fh/crs010.
HEYWOOD, S.. 'The Apostolate of the Pen': MGR De Segur and the Mobilization of Catholic Opinion in Second Empire France. French History, 2012-04-17, roč. 26, čís. 2, s. 203–221. Dostupné online [cit. 2020-05-24]. ISSN0269-1191. DOI: 10.1093/fh/crs010.
PAYNE, Howard C.. Theory and Practice of Political Police during the Second Empire in France. The Journal of Modern History, 1958-03, roč. 30, čís. 1, s. 14–23. Dostupné online [cit. 2020-05-24]. ISSN0022-2801. DOI: 10.1086/238159.