Gibson, W., & Wedd, C. B. (1913). The geology of the northern part of the Derbyshire coalfield and bordering tracts. H.M.S.O..
Lua i Stíl Chicago (17ú heag.)Gibson, Walcot, agus C. B. Wedd. The Geology of the Northern Part of the Derbyshire Coalfield and Bordering Tracts. London: H.M.S.O., 1913.
Lua MLA (8ú heag.)Gibson, Walcot, agus C. B. Wedd. The Geology of the Northern Part of the Derbyshire Coalfield and Bordering Tracts. H.M.S.O., 1913.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.