The Integral Investing Model and its success was referred to by Horst, D. (2014). Nachhaltige Geldanlage als Problembegriff in Faust, M. & Scholz, S. (Eds.) Nachhaltige Geldanlagen: Produkte, Strategien und Beratungskonzepte. (pages 151-166). Published in Frankfurt by Frankfurt School.

Furthermore, the Integral Investing Model and its success was referred to in Spinkart, K.P., & Gottwald, F.-T., (2013). FairFinance: Das Kapital der Zukunft; Auswege aus dem Raubtierkpitalismus. on page 162 published in Muenchen by Herbig.