Scottish Mathematics Group. (1967). Modern mathematics for schools, book 4. Chambers.
Lua i Stíl Chicago (17ú heag.)Scottish Mathematics Group. Modern Mathematics for Schools, Book 4. Glasgow : Blackie ; Edinburgh: Chambers, 1967.
Lua MLA (9ú heag.)Scottish Mathematics Group. Modern Mathematics for Schools, Book 4. Chambers, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.