Cita APA (7a ed.)

Earle, J., Ford, B., & Bowerman, P. (2009). Focus on geography (First publ. in 2008, 7. impr.). Maskew Miller Longman.

Cita Chicago Style (17a ed.)

Earle, John, Brendan Ford, y P. Bowerman. Focus on Geography. First publ. in 2008, 7. impr. Pinelands, Cape Town: Maskew Miller Longman, 2009.

Cita MLA (9a ed.)

Earle, John, et al. Focus on Geography. First publ. in 2008, 7. impr. Maskew Miller Longman, 2009.