Brobjer, Thomas H (1997). "Nietzsche's Reading and Private Library, 1885-1889". Journal of the History of Ideas. 58 (4). Project MUSE: 663–680. doi:10.1353/jhi.1997.0034. ISSN1086-3222.
Johan Grzelczyk, "Féré et Nietzsche : au sujet de la décadence"Archived 16 November 2006 at the Wayback Machine, HyperNietzsche, 2005-11-01 (in French). Grzelczyk quotes B. Wahrig-Schmidt, "Irgendwie, jedenfalls physiologisch. Friedrich Nietzsche, Alexandre Herzen (fils) und Charles Féré 1888" in Nietzsche Studien, Band 17, Berlin: Walter de Gruyter, 1988, p.439
Chapter I of Stirner and Nietzsche by Albert Lévy (Paris, Alcan, 1904); for the discussions of a possible influence of Stirner see: Bernd A. Laska: Nietzsche's initial crisis. (German original in: Germanic Notes and Reviews, vol. 33, n. 2, fall/Herbst 2002, pp. 109-133)
Johan Grzelczyk, "Féré et Nietzsche : au sujet de la décadence"Archived 16 November 2006 at the Wayback Machine, HyperNietzsche, 2005-11-01 (in French). Grzelczyk quotes B. Wahrig-Schmidt, "Irgendwie, jedenfalls physiologisch. Friedrich Nietzsche, Alexandre Herzen (fils) und Charles Féré 1888" in Nietzsche Studien, Band 17, Berlin: Walter de Gruyter, 1988, p.439
Brobjer, Thomas H (1997). "Nietzsche's Reading and Private Library, 1885-1889". Journal of the History of Ideas. 58 (4). Project MUSE: 663–680. doi:10.1353/jhi.1997.0034. ISSN1086-3222.