Joyce Vallar. (2011). Spelling: Pupil Book 4 (Collins Primary Focus) (New edition.). HarperCollins UK.
Chicago-čujuhus (17. p.)Joyce Vallar. Spelling: Pupil Book 4 (Collins Primary Focus). New edition. HarperCollins UK, 2011.
MLA-čujuhus (9. p.)Joyce Vallar. Spelling: Pupil Book 4 (Collins Primary Focus). New edition. HarperCollins UK, 2011.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.