Johnson, C. (2004). Elementary Business English: Test file. Pearson Education.
Citazione stile Chigago Style (17a edizione)Johnson, Christine. Elementary Business English: Test File. Essex: Pearson Education, 2004.
Citatione MLA (9a ed.)Johnson, Christine. Elementary Business English: Test File. Pearson Education, 2004.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.