Broadhurst, J. H. (1959). The development and use of a physical method for measuring the penetration of oxygen into coals. University of Birminghaml.
Citace podle Chicago (17th ed.)Broadhurst, John Henry. The Development and Use of a Physical Method for Measuring the Penetration of Oxygen into Coals. England: University of Birminghaml, 1959.
Citace podle MLA (8th ed.)Broadhurst, John Henry. The Development and Use of a Physical Method for Measuring the Penetration of Oxygen into Coals. University of Birminghaml, 1959.
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