Black, A. (1993). Political thought in Europe 1250-1450. Ir.
Chicago Style (17th ed.) ZitazioaBlack, Antony. Political Thought in Europe 1250-1450. Cambridge Univ: Ir, 1993.
MLA (9th ed.) ZitazioaBlack, Antony. Political Thought in Europe 1250-1450. Ir, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.