Powell, J. M. (ca. 2007). The Crusades, the Kingdom of Sicily, and the Mediterranean [Book]. In Variorum collected studies series. Ashgate Variorum.
Chicago Manual of Style 17th edition (author-date)Powell, James M. 2007. The Crusades, the Kingdom of Sicily, and the Mediterranean. Book. Variorum collected studies series. Variorum collected studies series 871. Aldershot: Ashgate Variorum.
Springer - Basic (author-date)Powell JM (2007) The Crusades, the Kingdom of Sicily, and the Mediterranean. Ashgate Variorum, Aldershot
Springer - Lecture Notes in Computer Science1.Powell, J.M.: The Crusades, the Kingdom of Sicily, and the Mediterranean. Ashgate Variorum, Aldershot (2007).
DIN 1505-2 (author-date, Deutsch) - standard superseded by ISO-690Powell, James M. ; ; ; : The Crusades, the Kingdom of Sicily, and the Mediterranean, Variorum collected studies series. book. Aldershot : Ashgate Variorum, 2007 — ISBN 9780754659174