Aubrecht, G. J. (1989). Energy. Merrill Pub.
Lua i Stíl Chicago (17ú heag.)Aubrecht, Gordon J. Energy. Columbus: Merrill Pub, 1989.
Lua MLA (9ú heag.)Aubrecht, Gordon J. Energy. Merrill Pub, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.