Oudshoorn, Nelly (1993), "United We Stand: The Pharmaceutical Industry, Laboratory, and Clinic in the Development of Sex Hormones into Scientific Drugs, 1920-1940", Science, Technology, & Human Values, 18 (1), Sage Publications, Inc.: 5–24 (in particular 9), doi:10.1177/016224399301800102, JSTOR689698
Renckens CN (December 2009). "In the interest of all who value their purse and their health: a brief history of the Vereniging tegen de Kwakzalverij--Society Against Quackery--of the Netherlands". Eval Health Prof. 32 (4): 343–8. doi:10.1177/0163278709346814. PMID19926608.
Oudshoorn, Nelly (1993), "United We Stand: The Pharmaceutical Industry, Laboratory, and Clinic in the Development of Sex Hormones into Scientific Drugs, 1920-1940", Science, Technology, & Human Values, 18 (1), Sage Publications, Inc.: 5–24 (in particular 9), doi:10.1177/016224399301800102, JSTOR689698
Frits van Dam (21 October 2015). "Het bestuur". Website VtdK. Retrieved 5 November 2015.
Van Der Smagt, C.P. (2001), "Wat wil de vereniging?", Vereniging Tegen de Kwakzalverij (in Dutch), retrieved 2009-06-23
Bestuur VtdK (30 November 1999). "Wat is kwakzalverij?". Kwakzalverij.nl (in Dutch). Vereniging tegen de Kwakzalverij. Retrieved 1 February 2015. (last modified on 23 February 2010).
Renckens CN (December 2009). "In the interest of all who value their purse and their health: a brief history of the Vereniging tegen de Kwakzalverij--Society Against Quackery--of the Netherlands". Eval Health Prof. 32 (4): 343–8. doi:10.1177/0163278709346814. PMID19926608.