APA (7th ed.) Citation

Gildas Sapiens 504-570. (1838). De excidio Brittannie.

Chicago Style (17th ed.) Citation

Gildas Sapiens 504-570. De Excidio Brittannie. London, 1838.

MLA (9th ed.) Citation

Gildas Sapiens 504-570. De Excidio Brittannie. 1838.

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