APA (7th ed.) Citation

Rigge, W. F. Polar triangles. s.n.

Chicago Style (17th ed.) Citation

Rigge, William F. Polar Triangles. [S.l.: s.n.

MLA (9th ed.) Citation

Rigge, William F. Polar Triangles. s.n.

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