John Jackman; Wendy Wren. (2013). Writing: Teacher's Guide 4 (Collins Primary Focus) (New edition.). HarperCollins UK.
Cita Chicago (17th ed.)John Jackman; Wendy Wren. Writing: Teacher's Guide 4 (Collins Primary Focus). New edition. HarperCollins UK, 2013.
Cita MLA (9th ed.)John Jackman; Wendy Wren. Writing: Teacher's Guide 4 (Collins Primary Focus). New edition. HarperCollins UK, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.