Cita APA (7a ed.)

Thom, M., & Armstrong, E. (2016). Geography for CCEA AS Level (AS Level, 2nd edition.). Colourpoint Educational.

Cita Chicago Style (17a ed.)

Thom, Martin, y Eileen Armstrong. Geography for CCEA AS Level. AS Level, 2nd edition. Newtownards, County Down, Northern Ireland: Colourpoint Educational, 2016.

Cita MLA (9a ed.)

Thom, Martin, y Eileen Armstrong. Geography for CCEA AS Level. AS Level, 2nd edition. Colourpoint Educational, 2016.