• Claudio Rendina, Federico II di Svevia - Lo specchio del mondo, Newton Compton, Rome, 1995, ISBN 88-7983-957-8.
• David Abulafia, Frederick II. A Medieval Emperor, Allen Lane the Penguin Press, 1988, ISBN 88-06-13197-4 (Italian edition).
• Georgina Masson, Frederick II of Hohenstaufen, Martin Secker & Warburg, 1957, ISBN 88-452-9107-3 (Italian edition).
• Karen Armstrong, Holy War - The Crusades and Their Impact on Today's World, Anchor Books, second edition, tháng 12 năm 2001, ISBN 0-385-72140-4.
• R.H.C. Davis, A History of Medieval Europe, Longman Group UK Limited, second edition, 1988, ISBN 0-582-01404-2.
• Amin Maalouf, The Crusades Through Arab Eyes, Schocken, 1989, ISBN 0-8052-0898-4.
• Geoffrey Barraclough, The Origins of Modern Germany Norton, second edition, Norton, 1984 (2d ed. publ. 1947), ISBN 0-393-30153-2.
• "Bibliographie zur Geschichte Kaiser Friedrichs II. Und der letzten Staufer", by Carl Arnold Willemsen. Pub: Monumenta Germaniae Historica (1986)

Ngoài ra, bài viết này có những đoạn dịch từ bài Friedrich II. (HRR), bên Wikipedia tiếng Đức. Bài Friedrich II. (HRR) có những tài liệu sau:

• Klaus van Eickels: Friedrich II., in: Bernd Schneidmüller/Stefan Weinfurter (editors): Die deutschen Herrscher des Mittelalters, Historische Porträts von Heinrich I. bis Maximilian I., Munich 2003, p. 293-314 and p. 585 (Bibliography). An outstanding short biography. Van Eickels also edited a volume of source materials on Frederick II.
• Ernst Kantorowicz: Kaiser Friedrich II., 2. volumes, Stuttgart 1985-86 (Nachdruck der Ausgabe aus den 20er Jahren), Beautifully written, but very romanticized, so to be read with caution. The author belonged to the circle of Stefan George;
• Wolfgang Stürner: Friedrich II. (Gestalten des Mittelalters und der Renaissance), 2 volumes, Darmstadt 1992-2000. The best and most recent biography of Frederick II. Sober and objective, with an extensive guide to other literature on its subject.
• Gunther Wolf (editor).: Stupor mundi. Zur Geschichte Friedrichs II. von Hohenstaufen (Wege der Forschung 101), 2. veränderte Aufl., Darmstadt 1982. An important collection of essays on Frederick II.