APA (7 वां संस्करण) प्रशस्ति पत्र

Hazlehurst, J. (2009). Tolley's industrial and commercial gas installation practice (5th ed.). Elsevier/Newnes.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Hazlehurst, John. Tolley's Industrial and Commercial Gas Installation Practice. 5th ed. Burlington, MA: Elsevier/Newnes, 2009.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Hazlehurst, John. Tolley's Industrial and Commercial Gas Installation Practice. 5th ed. Elsevier/Newnes, 2009.