Cita APA (7a ed.)

O'Connor, R. (1971). The oil barons: Men of greed and grandeur (3. print.). Little, Brown.

Cita Chicago Style (17a ed.)

O'Connor, Richard. The Oil Barons: Men of Greed and Grandeur. 3. print. Boston [u.a.]: Little, Brown, 1971.

Cita MLA (8a ed.)

O'Connor, Richard. The Oil Barons: Men of Greed and Grandeur. 3. print. Little, Brown, 1971.