Cita APA (7a ed.)

Berridge, V., & Edwards, G. (1981). Opium and the people: Opiate use in 19th-century England. Allen Lane.

Cita Chicago Style (17a ed.)

Berridge, Virginia, y Griffith Edwards. Opium and the People: Opiate Use in 19th-century England. London [u.a.]: Allen Lane, 1981.

Cita MLA (8a ed.)

Berridge, Virginia, y Griffith Edwards. Opium and the People: Opiate Use in 19th-century England. Allen Lane, 1981.