Feather, R. M., & Snyder, S. L. (1999). Glencoe earth science. Glencoe/McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Feather, Ralph M., agus Susan Leach Snyder. Glencoe Earth Science. New york: Glencoe/McGraw Hill, 1999.
Lua MLA (9ú heag.)Feather, Ralph M., agus Susan Leach Snyder. Glencoe Earth Science. Glencoe/McGraw Hill, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.