APA (7th ed.) Citation

Brion, M., Cremonesi, G., & Swaan, W. (1969). The Medici: A great Florentine family. Elek Books.

Chicago Style (17th ed.) Citation

Brion, Marcel, Gilles Cremonesi, and Wim Swaan. The Medici: A Great Florentine Family. London: Elek Books, 1969.

MLA (9th ed.) Citation

Brion, Marcel, et al. The Medici: A Great Florentine Family. Elek Books, 1969.