APA (7th ed.) Citation

Powell, T. G. E. (1967). The celts (1st. ed., reprinted.). Thames and Hudson.

Chicago Style (17th ed.) Citation

Powell, T. G. E. The Celts. 1st. ed., reprinted. London: Thames and Hudson, 1967.

MLA (9th ed.) Citation

Powell, T. G. E. The Celts. 1st. ed., reprinted. Thames and Hudson, 1967.