APA (7th ed.) Citation

Gillingham, J., & Chaplin, B. (1977). Charlemagne. Chambers.

Chicago Style (17th ed.) Citation

Gillingham, John, and Brian Chaplin. Charlemagne. Edinburgh: Chambers, 1977.

MLA (9th ed.) Citation

Gillingham, John, and Brian Chaplin. Charlemagne. Chambers, 1977.