APA (7th ed.) Citation

Nelson, H. J., & Sorensen, H. C. (1928). Danish market for musical instruments. [publisher not identified].

Chicago Style (17th ed.) Citation

Nelson, Harold Jr, and Harry C. Sorensen. Danish Market for Musical Instruments. Washington, D.C.: [publisher not identified], 1928.

MLA (9th ed.) Citation

Nelson, Harold Jr, and Harry C. Sorensen. Danish Market for Musical Instruments. [publisher not identified], 1928.