Cita APA (7th ed.)
Seefeldt, J., & Syre, L. (2007). Portals to the past and to the future: Libraries in Germany (2nd ed.). Georg Olms Verlag.
Cita Chicago (17th ed.)
Seefeldt, Jurgen, i Ludger Syre. Portals to the Past and to the Future: Libraries in Germany. 2nd ed. New York: Georg Olms Verlag, 2007.
Cita MLA (9th ed.)
Seefeldt, Jurgen, i Ludger Syre. Portals to the Past and to the Future: Libraries in Germany. 2nd ed. Georg Olms Verlag, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.