↑Villa, Guido (2013). Contemporary psychology (yn Saesneg). Abingdon, Efrog Newydd: Routledge. t. 21. ISBN9780415296229.
↑Dwyer, Philip (1996). Charles-Maurice de Talleyrand, 1754-1838 : a bibliography (yn Saesneg). Westport, Conn: Greenwood Press. t. 25. ISBN9780313293542.
↑Jones, Colin (2013). The Longman companion to the French revolution. Oxfordshire, England New York: Routledge. t. 76. ISBN9781317870807.
↑George Crabbe (1954). George Crabbe, 1754-1832, Bi-centenary Celebrations: The Seventh Aldeburgh Festival of Music and the Arts...12-20 June, 1954 : Exhibition of Works and Manuscripts Held at the Moot Hall, Aldeburgh (yn Saesneg). Festival Committee. t. 3.