Thurber, W. A., & Kilburn, R. E. (1967). Exploring earth science. Allyn r Bacon.
Lua i Stíl Chicago (17ú heag.)Thurber, Walter A., agus Robert E. Kilburn. Exploring Earth Science. Allyn r Bacon, 1967.
Lua MLA (8ú heag.)Thurber, Walter A., agus Robert E. Kilburn. Exploring Earth Science. Allyn r Bacon, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.