Não informado. (2019). Energy it. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Não informado. Energy It. New York: McGraw-Hill, 2019.
Lua MLA (8ú heag.)Não informado. Energy It. McGraw-Hill, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.