1.
Frederick II. London: Pimlico; 1992.
Frederick II. London : Pimlico, 26 juin 1992. ISBN 0-7126-9829-9
Abulafia David. (1992). Frederick II: A médieval emperor. Pimlico.
MLA (8th ed.) CitationAbulafia David. Frederick II: A Médieval Emperor. Pimlico, 1992.
Warning: These citations may not always be 100% accurate.