APA (7th ed.) Citation

Einhard, -., Notker, B., & Grant, A. J. (1922). Early lives of Charlemagne. Chatto & Windus.

Chicago Style (17th ed.) Citation

Einhard, -840, Balbulus Notker, and A. J. Grant. Early Lives of Charlemagne. London: Chatto & Windus, 1922.

MLA (9th ed.) Citation

Einhard, -840, et al. Early Lives of Charlemagne. Chatto & Windus, 1922.