Haeberle, E. J., & Simons, W. (1995). Sexology in Europe: A Directory of Institutions, Organizations, Resource Centers, Training Programs, and Scientific Journals / Erwin J. Haeberle, Wolfgang Simons (eds.). Robert-Koch-Institut.
Lua i Stíl Chicago (17ú heag.)Haeberle, Erwin J., agus Wolfgang Simons. Sexology in Europe: A Directory of Institutions, Organizations, Resource Centers, Training Programs, and Scientific Journals / Erwin J. Haeberle, Wolfgang Simons (eds.). Berlin: Robert-Koch-Institut, 1995.
Lua MLA (8ú heag.)Haeberle, Erwin J., agus Wolfgang Simons. Sexology in Europe: A Directory of Institutions, Organizations, Resource Centers, Training Programs, and Scientific Journals / Erwin J. Haeberle, Wolfgang Simons (eds.). Robert-Koch-Institut, 1995.
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