APA (7th ed.) Citation

Apel, H. (1967). DDR 1962, 1964, 1966. Voltaire.

Chicago Style (17th ed.) Citation

Apel, Hans. DDR 1962, 1964, 1966. Berlin: Voltaire, 1967.

MLA (8th ed.) Citation

Apel, Hans. DDR 1962, 1964, 1966. Voltaire, 1967.