Ejsmont, W., & Lehner, F. (2020). The Free Tangent Law.
Cita Chicago (17th ed.)Ejsmont, Wiktor, i Franz Lehner. The Free Tangent Law. 2020.
Cita MLA (9th ed.)Ejsmont, Wiktor, i Franz Lehner. The Free Tangent Law. 2020.
Atenció: Aquestes cites poden no estar 100% correctes.