Cita APA (7a ed.)

Fretwell, M., Kelly, D., & Nanson, J. (2015). Geography for Cambridge International AS & A level ([Student book], AS & A level, Cambridge International Examinations, endorsed for full syllabus coverage.). Oxford University Press.

Cita Chicago Style (17a ed.)

Fretwell, Muriel, David Kelly, y John Nanson. Geography for Cambridge International AS & A Level. [Student book], AS & A level, Cambridge International Examinations, endorsed for full syllabus coverage. Oxford: Oxford University Press, 2015.

Cita MLA (9a ed.)

Fretwell, Muriel, et al. Geography for Cambridge International AS & A Level. [Student book], AS & A level, Cambridge International Examinations, endorsed for full syllabus coverage. Oxford University Press, 2015.