APA (7th ed.) Citation

O'Sullivan, T. D. (1978). The De excidio of Gildas.

Chicago Style (17th ed.) Citation

O'Sullivan, Thomas David. The De Excidio of Gildas. 1978.

MLA (9th ed.) Citation

O'Sullivan, Thomas David. The De Excidio of Gildas. 1978.

Warning: These citations may not always be 100% accurate.