1. Einstein A ([1879–1902]/2020) The collected papers of Albert Einstein. Volume 1: the early years, 1879–1902 (English translation supplement). Princeton University Press, Princeton, pp 165–166. Digital project in process. https://einsteinpapers.press.princeton.edu/
2. Wilson EO (1998) Consilience: the unity of knowledge. Knopf, New York
3. Thompson SP ([1910]/1946) Calculus made easy, 3rd edn. St. Martin’s Press, New York
4. Fararo TJ (1989) The spirit of unification in sociological theory. Sociol Theory 7(2):175–190
5. Fararo TJ, Skvoretz J (1987) Unification research programs: integrating two structural theories. Am J Sociol 92(5):1183–1209. https://doi.org/10.1086/228632