Citazione Stile APA (7a Edizione)

Widdowson, J., Smith, J., & Knill, R. (2001). GCSE geography in focus (1. publ.). Murray.

Citazione stile Chigago Style (17a edizione)

Widdowson, John, John Smith, e Roger Knill. GCSE Geography in Focus. 1. publ. London: Murray, 2001.

Citatione MLA (9a ed.)

Widdowson, John, et al. GCSE Geography in Focus. 1. publ. Murray, 2001.