APA (7th ed.) Citation

Rung, H., & Rung, F. (1940). Albumsblade: For guitar. Hansen.

Chicago Style (17th ed.) Citation

Rung, Henrik, and Frederik Rung. Albumsblade: For Guitar. Kjøbenhavn [u.a.]: Hansen, 1940.

MLA (9th ed.) Citation

Rung, Henrik, and Frederik Rung. Albumsblade: For Guitar. Hansen, 1940.