Cita APA (7th ed.)
ebrary, Inc, & Greenhow, C. (2011). On the horizon. Emerald.
Cita Chicago (17th ed.)
ebrary, Inc, i Christine Greenhow. On the Horizon. [Bradford, UK]: Emerald, 2011.
Cita MLA (9th ed.)
ebrary, Inc, i Christine Greenhow. On the Horizon. Emerald, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.