O'Connor, R. (1971). The oil barons: Men of greed and grandeur (3. print.). Little, Brown.
Chicago-Zitierstil (17. Ausg.)O'Connor, Richard. The Oil Barons: Men of Greed and Grandeur. 3. print. Boston [u.a.]: Little, Brown, 1971.
MLA-Zitierstil (8. Ausg.)O'Connor, Richard. The Oil Barons: Men of Greed and Grandeur. 3. print. Little, Brown, 1971.
警告：這些引文格式不一定是100％准確.