(de) Hans Günter Zekl, Aristoteles: Metaphysik, Würzburg, Königshausen & Neumann, (lire en ligne), p. 26
(en) Joseph Agassi, Science and its history: a reassessment of the historiography of science, Springer, (lire en ligne), p. 310
(en) Karl Popper, The Myth of the Framework: In defence of science and rationality, Londres, Routledge, (lire en ligne), p. 33
marx2mao.com
(en) Vladimir I. Lenin, The Economic Content of Narodism and the Criticism of It in Mr. Struve's Book, Moscou, Progress Publishers, (lire en ligne), p. 433