1. C. Wright Mills Papers, Dolph Briscoe Center for American History, University of Texas.
2. Denmark-America Foundation and the Fulbright Commission, Danish National Archives, Copenhagen.
3. Elsa Gress, personal papers, Royal Library, Copenhagen.
4. Henning Friis’ Private Papers, Danish National Archives, Copenhagen.
5. Agersnap, T. (1996). Sociologi i Danmark før 1950. In F. Hansson & K.A. Nielsen (Eds. 61-122). Dansk sociologis historie. Et politiseret fag gennem brud og kontinuitet. Forlaget Sociologi.