APA (7th ed.) Citation

Friedrich, J. (1964). Ferdinand Sommer (1875-1962).

Chicago Style (17th ed.) Citation

Friedrich, Johannes. Ferdinand Sommer (1875-1962). 1964.

MLA (8th ed.) Citation

Friedrich, Johannes. Ferdinand Sommer (1875-1962). 1964.

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