APA (7th ed.) Citation

Procopio, Dewing, H. B., & Downey, G. (1961). Procopius. William Heinemann [etc.].

Chicago Style (17th ed.) Citation

Procopio, Henry Bronson Dewing, and Glanville Downey. Procopius. London [etc.]: William Heinemann [etc.], 1961.

MLA (9th ed.) Citation

Procopio, et al. Procopius. William Heinemann [etc.], 1961.