APA (7th ed.) Citation

Wiet, G., Devisse, J., Meggers, B. J., & Green, R. P. H. (1975). The great medieval civilizations. George Allen und Unwin.

Chicago Style (17th ed.) Citation

Wiet, Gaston, Jean Devisse, Betty Jane Meggers, and Roger P. H. Green. The Great Medieval Civilizations. London: George Allen und Unwin, 1975.

MLA (9th ed.) Citation

Wiet, Gaston, et al. The Great Medieval Civilizations. George Allen und Unwin, 1975.