APA (7th ed.) Citation

Gildas, 5. G. On the Ruin of Britain.

Chicago Style (17th ed.) Citation

Gildas, 516?-570?; Giles. On the Ruin of Britain.

MLA (9th ed.) Citation

Gildas, 516?-570?; Giles. On the Ruin of Britain.

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