APA

BARBOUR N., . (1974). The Emperor Frederick II, king of Jerusalem and Sicily, and his relations with the Muslims. Leiden: Brill.

Chicago

BARBOUR Nevill, . 1974. The Emperor Frederick II, king of Jerusalem and Sicily, and his relations with the Muslims. Leiden: Brill.

Harvard

BARBOUR N., . (1974). The Emperor Frederick II, king of Jerusalem and Sicily, and his relations with the Muslims. Leiden: Brill.

MLA

BARBOUR Nevill, . The Emperor Frederick II, king of Jerusalem and Sicily, and his relations with the Muslims. Leiden: Brill. 1974.