Orth M, Trimble MR. Friedrich Nietzsche's mental illness—general paralysis of the insane vs. frontotemporal dementia // Acta Psychiatrica Scandinavica 114 (6). декември 2006. DOI:10.1111/j.1600-0447.2006.00827.x. с. 439 – 444; discussion 445.
Stephan Güntzel, „Nietzsche's Geophilosophy“Архив на оригинала от 2007-09-27 в Wayback Machine., p.85 in: Journal of Nietzsche Studies 25 (Spring 2003), The Pennsylvania State University Press, University Park (Penn State), 2003-10-15; re-published on HyperNietzsche's website ((en))/((de))
Wicks, R. (Summer 2011) „Friedrich Nietzsche“. The Stanford Encyclopedia of Philosophy, Edward N. Zalta (ed.) Посетен на 6 октомври 2011.
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Stephan Güntzel, „Nietzsche's Geophilosophy“Архив на оригинала от 2007-09-27 в Wayback Machine., p.85 in: Journal of Nietzsche Studies 25 (Spring 2003), The Pennsylvania State University Press, University Park (Penn State), 2003-10-15; re-published on HyperNietzsche's website ((en))/((de))
