John Jackman; Wendy Wren. (2013). Writing: Teacher's Guide 4 (Collins Primary Focus) (New edition.). HarperCollins UK.
Chicago Style aipamenaJohn Jackman; Wendy Wren. Writing: Teacher's Guide 4 (Collins Primary Focus). New edition. HarperCollins UK, 2013.
MLA aipamenaJohn Jackman; Wendy Wren. Writing: Teacher's Guide 4 (Collins Primary Focus). New edition. HarperCollins UK, 2013.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.