Cita APA (7th ed.)

Joyce Vallar. (2011). Spelling: Pupil Book 4 (Collins Primary Focus) (New edition.). HarperCollins UK.

Cita Chicago (17th ed.)

Joyce Vallar. Spelling: Pupil Book 4 (Collins Primary Focus). New edition. HarperCollins UK, 2011.

Cita MLA (9th ed.)

Joyce Vallar. Spelling: Pupil Book 4 (Collins Primary Focus). New edition. HarperCollins UK, 2011.

Atenció: Aquestes cites poden no estar 100% correctes.