Long, D. (2003). Gas Trading Manual (Second Edition). ELSEVIER.
Lua i Stíl Chicago (17ú heag.)Long, David. Gas Trading Manual (Second Edition). ELSEVIER, 2003.
Lua MLA (8ú heag.)Long, David. Gas Trading Manual (Second Edition). ELSEVIER, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.