International Berlin Conference for Sexology 1990 Berlin, Germany) (International Berlin Conference for Sexology 1990 Berlin, Germany))

• 
  Bisexualities: The Ideology and Practice of Sexual Contact With Both Men and Women
  by International Berlin Conference for Sexology 1990 Berlin, Germany), Erwin J. Haeberle, Rolf Gindorf
  Hardcover, Continuum Intl Pub Group, ISBN 0826409237 (0-8264-0923-7)