Richards, W. (1877). A practical treatise on the manufacture and distribution of coal gas. E. & F. Spon.
Lua i Stíl Chicago (17ú heag.)Richards, William. A Practical Treatise on the Manufacture and Distribution of Coal Gas. London, New York: E. & F. Spon, 1877.
Lua MLA (8ú heag.)Richards, William. A Practical Treatise on the Manufacture and Distribution of Coal Gas. E. & F. Spon, 1877.
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