Cita APA (7a ed.)
Gentle Machine Productions (Firma) & Joseph, P. (2011). Zeitgeist: Moving forward. Gentle Machine Productions.
Cita Chicago Style (17a ed.)
Gentle Machine Productions (Firma) y Peter Joseph. Zeitgeist: Moving Forward. [S.l.]: Gentle Machine Productions, 2011.
Cita MLA (9a ed.)
Gentle Machine Productions (Firma) y Peter Joseph. Zeitgeist: Moving Forward. Gentle Machine Productions, 2011.
Precaución: Estas citas no son 100% exactas.