Não informado. (1974). Tribology International: The practice & technology of lubrication, wear prevention & friction control. Butterworth Scientific.
Lua i Stíl Chicago (17ú heag.)Não informado. Tribology International: The Practice & Technology of Lubrication, Wear Prevention & Friction Control. Guildford, Inglaterra: Butterworth Scientific, 1974.
Lua MLA (8ú heag.)Não informado. Tribology International: The Practice & Technology of Lubrication, Wear Prevention & Friction Control. Butterworth Scientific, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.