Não informado. (1922). Refiner and Natural Gasoline Manufacturer. Gulf Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Refiner and Natural Gasoline Manufacturer. Houston, Tex: Gulf Publishing, 1922.
Lua MLA (8ú heag.)Não informado. Refiner and Natural Gasoline Manufacturer. Gulf Publishing, 1922.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.