Broadhurst, J. H. (1959). The development and use of a physical method for measuring the penetration of oxygen into coals. University of Birminghaml.
Lua i Stíl Chicago (17ú heag.)Broadhurst, John Henry. The Development and Use of a Physical Method for Measuring the Penetration of Oxygen into Coals. England: University of Birminghaml, 1959.
Lua MLA (8ú heag.)Broadhurst, John Henry. The Development and Use of a Physical Method for Measuring the Penetration of Oxygen into Coals. University of Birminghaml, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.