Davis, I. C. (1954). Teacher's manual and answer book to accompany Science 1 and Science 2. Henry Holt and Co..
Lua i Stíl Chicago (17ú heag.)Davis, Ira C. Teacher's Manual and Answer Book to Accompany Science 1 and Science 2. New York: Henry Holt and Co., 1954.
Lua MLA (8ú heag.)Davis, Ira C. Teacher's Manual and Answer Book to Accompany Science 1 and Science 2. Henry Holt and Co., 1954.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.