Lawn, J. G. (1911). Mine accounts and mining book-keeping: A manual for the use of students, managers of metalliferous mines and collieries, and others interested in mining (Ed. 7.). C. Griffin & company, limited.
Lua i Stíl Chicago (17ú heag.)Lawn, James Gunson. Mine Accounts and Mining Book-keeping: A Manual for the Use of Students, Managers of Metalliferous Mines and Collieries, and Others Interested in Mining. Ed. 7. London: C. Griffin & company, limited, 1911.
Lua MLA (8ú heag.)Lawn, James Gunson. Mine Accounts and Mining Book-keeping: A Manual for the Use of Students, Managers of Metalliferous Mines and Collieries, and Others Interested in Mining. Ed. 7. C. Griffin & company, limited, 1911.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.