APA (7th ed.) Citation

Jacobsen, J. P., & Larsen, H. A. (1946). Niels Lyhne. The American-Scandinavian foundation [etc.,etc].

Chicago Style (17th ed.) Citation

Jacobsen, J. P., and Hanna Astrup Larsen. Niels Lyhne. New York: The American-Scandinavian foundation [etc.,etc], 1946.

MLA (8th ed.) Citation

Jacobsen, J. P., and Hanna Astrup Larsen. Niels Lyhne. The American-Scandinavian foundation [etc.,etc], 1946.