John Jackman. (2011). Comprehension: Introductory Pupil Book (Collins Primary Focus) (Revised ed.). HarperCollins UK.
Chicago-referens (17:e uppl.)John Jackman. Comprehension: Introductory Pupil Book (Collins Primary Focus). Revised ed. HarperCollins UK, 2011.
MLA-referens (9:e uppl.)John Jackman. Comprehension: Introductory Pupil Book (Collins Primary Focus). Revised ed. HarperCollins UK, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.