APA (7th ed.) Citation

Friedrich, J. (1957). Exstinct (im Katalog Extinct) Languages.

Chicago Style (17th ed.) Citation

Friedrich, Joh. Exstinct (im Katalog Extinct) Languages. 1957.

MLA (8th ed.) Citation

Friedrich, Joh. Exstinct (im Katalog Extinct) Languages. 1957.

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