APA (7th ed.) Citation

Sauerbrey, U. (2015). Friedrich Fröbel. Druckerei?.

Chicago Style (17th ed.) Citation

Sauerbrey, Ulf. Friedrich Fröbel. Erfurt?: Druckerei?, 2015.

MLA (8th ed.) Citation

Sauerbrey, Ulf. Friedrich Fröbel. Druckerei?, 2015.

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