APA (7th ed.) Citation

Powell, T. G. E. (1959). The Celts (Rev. ed.). Thames and Hudson.

Chicago Style (17th ed.) Citation

Powell, Thomas G. E. The Celts. Rev. ed. London: Thames and Hudson, 1959.

MLA (9th ed.) Citation

Powell, Thomas G. E. The Celts. Rev. ed. Thames and Hudson, 1959.