Hazlehurst, J. (2009). Tolley's industrial and commercial gas installation practice (5th ed.). Elsevier/Newnes.
Chicago-referens (17:e uppl.)Hazlehurst, John. Tolley's Industrial and Commercial Gas Installation Practice. 5th ed. Burlington, MA: Elsevier/Newnes, 2009.
MLA-referens (9:e uppl.)Hazlehurst, John. Tolley's Industrial and Commercial Gas Installation Practice. 5th ed. Elsevier/Newnes, 2009.
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