Schulz, P., Lütjens, C., Gawronski, M., Andrews, N., Heine, N., & Baldiga, J. (2013). Positive pictures: A gay history / Paul Schulz & Christian Lütjens. [Editor: Mischa Gawronski. Translation from the German: Nicholas Andrews, Nicola Heine. With photos and artwork by Jürgen Baldiga.]. Gmünder.
Lua i Stíl Chicago (17ú heag.)Schulz, Paul, Christian Lütjens, Mischa Gawronski, Nicholas Andrews, Nicola Heine, agus Jürgen Baldiga. Positive Pictures: A Gay History / Paul Schulz & Christian Lütjens. [Editor: Mischa Gawronski. Translation from the German: Nicholas Andrews, Nicola Heine. With Photos and Artwork by Jürgen Baldiga.]. Berlin: Gmünder, 2013.
Lua MLA (8ú heag.)Schulz, Paul, et al. Positive Pictures: A Gay History / Paul Schulz & Christian Lütjens. [Editor: Mischa Gawronski. Translation from the German: Nicholas Andrews, Nicola Heine. With Photos and Artwork by Jürgen Baldiga.]. Gmünder, 2013.