Cita APA (7a ed.)
Steffen, A., & Gore, A. (2008). WorldChanging: A User's Guide for the 21st Century. Harry N. Abrams.
Cita estilo Chicago (17a ed.)
Steffen, Alex, y Al Gore. WorldChanging: A User's Guide for the 21st Century. Nueva York, EUA: Harry N. Abrams, 2008.
Cita MLA (9a ed.)
Steffen, Alex, y Al Gore. WorldChanging: A User's Guide for the 21st Century. Harry N. Abrams, 2008.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.