APA (7th ed.) Citation

Maddison, F. (2019). Hugo Helt and the Rojas astrolabe projection.

Chicago Style (17th ed.) Citation

Maddison, Francis. Hugo Helt and the Rojas Astrolabe Projection. 2019.

MLA (8th ed.) Citation

Maddison, Francis. Hugo Helt and the Rojas Astrolabe Projection. 2019.

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