HIGGINS,R.A. (1974). ENGINEERING MATALLURGY. ENGLISH UNIV. PRESS.
Lua i Stíl Chicago (17ú heag.)HIGGINS,R.A. ENGINEERING MATALLURGY. LONDON: ENGLISH UNIV. PRESS, 1974.
Lua MLA (9ú heag.)HIGGINS,R.A. ENGINEERING MATALLURGY. ENGLISH UNIV. PRESS, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.