Campbell, A. (1918). Petroleum refining. C. Griffin and company, limited.
Lua i Stíl Chicago (17ú heag.)Campbell, Andrew. Petroleum Refining. London: C. Griffin and company, limited, 1918.
Lua MLA (8ú heag.)Campbell, Andrew. Petroleum Refining. C. Griffin and company, limited, 1918.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.