Cita APA (7a ed.)

Robottom, J., & O'Keeffe, J. (1987). America 1870 - 1975 (1. publ., 3. impr.). Longman.

Cita Chicago Style (17a ed.)

Robottom, John, y John O'Keeffe. America 1870 - 1975. 1. publ., 3. impr. Burnt Mill [u.a.]: Longman, 1987.

Cita MLA (9a ed.)

Robottom, John, y John O'Keeffe. America 1870 - 1975. 1. publ., 3. impr. Longman, 1987.