APA (7th ed.) Citation

Hund, A. (1936). Phenomena in high-frequency systems. McGraw-Hill Book Co.

Chicago Style (17th ed.) Citation

Hund, August. Phenomena in High-frequency Systems. New York: McGraw-Hill Book Co, 1936.

MLA (9th ed.) Citation

Hund, August. Phenomena in High-frequency Systems. McGraw-Hill Book Co, 1936.