John Jackman. (2011). Comprehension: Introductory Pupil Book (Collins Primary Focus) (Revised ed.). HarperCollins UK.
Citazione stile Chigago Style (17a edizione)John Jackman. Comprehension: Introductory Pupil Book (Collins Primary Focus). Revised ed. HarperCollins UK, 2011.
Citatione MLA (9a ed.)John Jackman. Comprehension: Introductory Pupil Book (Collins Primary Focus). Revised ed. HarperCollins UK, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.