Assessment and Qualifications Alliance, Helm, J., & Robinson, A. (2002). GCSE Geography for AQA specification B (1. publ.). Heinemann.
Citazione stile Chigago Style (17a edizione)Assessment and Qualifications Alliance, Janet Helm, e Arthur Robinson. GCSE Geography for AQA Specification B. 1. publ. Oxford: Heinemann, 2002.
Citatione MLA (9a ed.)Assessment and Qualifications Alliance, et al. GCSE Geography for AQA Specification B. 1. publ. Heinemann, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.