APA (7th ed.) Citation

Frei, G., & Roquette, P. (2002). Helmut Hasse in Halle. Aspekte der Mathematikgeschichte in Halle.

Chicago Style (17th ed.) Citation

Frei, Günther, and Peter Roquette. "Helmut Hasse in Halle." Aspekte Der Mathematikgeschichte in Halle 2002.

MLA (9th ed.) Citation

Frei, Günther, and Peter Roquette. "Helmut Hasse in Halle." Aspekte Der Mathematikgeschichte in Halle, 2002.

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