Barker, D. S. (1983). Igneous rocks. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Barker, Daniel S. Igneous Rocks. New Jersey: Prentice-Hall, 1983.
Lua MLA (9ú heag.)Barker, Daniel S. Igneous Rocks. Prentice-Hall, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.