Cita APA (7a ed.)

Butler, D., & Freeman, J. (1968). British political facts. 1900-1967 (2. ed.). Macmillan.

Cita Chicago Style (17a ed.)

Butler, David, y Jennie Freeman. British Political Facts. 1900-1967. 2. ed. London [u.a.]: Macmillan, 1968.

Cita MLA (9a ed.)

Butler, David, y Jennie Freeman. British Political Facts. 1900-1967. 2. ed. Macmillan, 1968.