DUNCAN, E. R. (1972). Modern school mathematics structure and use. Houghton Mifflin co.
Lua i Stíl Chicago (17ú heag.)DUNCAN, Ernest R. Modern School Mathematics Structure and Use. Boston: Houghton Mifflin co, 1972.
Lua MLA (9ú heag.)DUNCAN, Ernest R. Modern School Mathematics Structure and Use. Houghton Mifflin co, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.