Kuhn, Thomas (1970). «Reflections on my critics». In: Imre Lakatos; Alan Musgrave. Criticism and the growth of knowledge: Proceedings of the International Colloquium in the Philosophy of Science [held at Bedford college, Regent's Park, London, from July 11th to 17th 1965] Reprint ed. Cambridge: Cambridge University Press. pp. 244–245. ISBN0521096235
books.google.com
Brakel, Jaap, "protoscience and protochemistry", Philosophy of chemistry: between the manifest and the scientific image, Leuven Univ Pr, December 2000
centerforinquiry.org
cdn.centerforinquiry.org
Bunge, Mario (1984). «What is pseudoscience?». The Skeptical Inquirer. 9. pp. 36–46 (pdf copy. Bunge defines protosciences as "emerging sciences" which "advance and end up by becoming sciences". (p.44)