(2007). Introduction to underground coal mining: A programmed text.
Chicago-čujuhus (17. p.)Introduction to Underground Coal Mining: A Programmed Text. 2007.
MLA-čujuhus (9. p.)Introduction to Underground Coal Mining: A Programmed Text. 2007.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.