Stephan, P. (2012). Google Office in Düsseldorf: Design: Lepel & Lepel Architektur, Köln. AIT.
Cita Chicago (17th ed.)Stephan, Petra. "Google Office in Düsseldorf: Design: Lepel & Lepel Architektur, Köln." AIT 2012.
Cita MLA (8th ed.)Stephan, Petra. "Google Office in Düsseldorf: Design: Lepel & Lepel Architektur, Köln." AIT, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.