Lewis, R. S., & Clark, G. B. (1964). Elements of mining (3rd ed.). Wiley.
Lua i Stíl Chicago (17ú heag.)Lewis, Robert Strong, agus George Bromley Clark. Elements of Mining. 3rd ed. New York: Wiley, 1964.
Lua MLA (9ú heag.)Lewis, Robert Strong, agus George Bromley Clark. Elements of Mining. 3rd ed. Wiley, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.