Ho Peck Leng. (2017). Cambridge Primary Science Pupil's Book 4. Marshall Cavendish.
Lua i Stíl Chicago (17ú heag.)Ho Peck Leng. Cambridge Primary Science Pupil's Book 4. Singapore: Marshall Cavendish, 2017.
Lua MLA (9ú heag.)Ho Peck Leng. Cambridge Primary Science Pupil's Book 4. Marshall Cavendish, 2017.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.