APA (7th ed.) Citation

Küppers, L. (1968). Barbara. Bongers.

Chicago Style (17th ed.) Citation

Küppers, Leonhard. Barbara. Recklinghausen: Bongers, 1968.

MLA (9th ed.) Citation

Küppers, Leonhard. Barbara. Bongers, 1968.

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