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.