Gibson, W., & Wedd, C. B. (1913). The geology of the northern part of the Derbyshire coalfield and bordering tracts. H.M.S.O..
Citace podle Chicago (17th ed.)Gibson, Walcot, a C. B. Wedd. The Geology of the Northern Part of the Derbyshire Coalfield and Bordering Tracts. London: H.M.S.O., 1913.
Citace podle MLA (8th ed.)Gibson, Walcot, a C. B. Wedd. The Geology of the Northern Part of the Derbyshire Coalfield and Bordering Tracts. H.M.S.O., 1913.
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