O'Connor, R. (1971). The oil barons: Men of greed and grandeur (3. print.). Little, Brown.
Lua i Stíl Chicago (17ú heag.)O'Connor, Richard. The Oil Barons: Men of Greed and Grandeur. 3. print. Boston [u.a.]: Little, Brown, 1971.
Lua MLA (8ú heag.)O'Connor, Richard. The Oil Barons: Men of Greed and Grandeur. 3. print. Little, Brown, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.