APA (7th ed.) Citation

Keresztes, P. (1981). Constantine: A great christian monarch and apostle. Gieben.

Chicago Style (17th ed.) Citation

Keresztes, Paul. Constantine: A Great Christian Monarch and Apostle. Amsterdam: Gieben, 1981.

MLA (8th ed.) Citation

Keresztes, Paul. Constantine: A Great Christian Monarch and Apostle. Gieben, 1981.

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