APA-referens (7:e uppl.)

Richards, W. (1877). A practical treatise on the manufacture and distribution of coal gas. E. & F. Spon.

Chicago-referens (17:e uppl.)

Richards, William. A Practical Treatise on the Manufacture and Distribution of Coal Gas. London, New York: E. & F. Spon, 1877.

MLA-referens (8:e uppl.)

Richards, William. A Practical Treatise on the Manufacture and Distribution of Coal Gas. E. & F. Spon, 1877.