Thompson, G. R., & Turk, J. Earth science and the environment.
Lua i Stíl Chicago (17ú heag.)Thompson, Graham R., agus Jonathan Turk. Earth Science and the Environment.
Lua MLA (9ú heag.)Thompson, Graham R., agus Jonathan Turk. Earth Science and the Environment.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.