Fiona Baxter; Liz Dilley; Alan Cross; Jon Board. (2014). Cambridge Primary Science Stage 4 Learner's Book. CAMBRIDGE UNIVERSITY PRESS.
Chicago-viite (17. p.)Fiona Baxter; Liz Dilley; Alan Cross; Jon Board. Cambridge Primary Science Stage 4 Learner's Book. CAMBRIDGE UNIVERSITY PRESS, 2014.
MLA-viite (9. p.)Fiona Baxter; Liz Dilley; Alan Cross; Jon Board. Cambridge Primary Science Stage 4 Learner's Book. CAMBRIDGE UNIVERSITY PRESS, 2014.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.