APA (7th ed.) Citation

Bortowski, A., & Jansen, J. H. A. (1964). Ex Libris Johan H.A. Jansen.

Chicago Style (17th ed.) Citation

Bortowski, Andrzej, and Johan H. A. Jansen. Ex Libris Johan H.A. Jansen. 1964.

MLA (9th ed.) Citation

Bortowski, Andrzej, and Johan H. A. Jansen. Ex Libris Johan H.A. Jansen. 1964.

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