(2007). Introduction to underground coal mining: A programmed text.
Lua i Stíl Chicago (17ú heag.)Introduction to Underground Coal Mining: A Programmed Text. 2007.
Lua MLA (9ú heag.)Introduction to Underground Coal Mining: A Programmed Text. 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.