APA (7th ed.) Citation

Opelt, I. (1966). "Doctrina" und "Doctrina Christiana".

Chicago Style (17th ed.) Citation

Opelt, Ilona. "Doctrina" Und "Doctrina Christiana". 1966.

MLA (9th ed.) Citation

Opelt, Ilona. "Doctrina" Und "Doctrina Christiana". 1966.

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