Almazan, A. D. (1992). The Gravitational potentials on the spherical and the ellipsoidal surfaces.
Cita Chicago (17th ed.)Almazan, Anselmo D. The Gravitational Potentials on the Spherical and the Ellipsoidal Surfaces. Quezon City : UP College of Engineering, 1992.
Cita MLA (9th ed.)Almazan, Anselmo D. The Gravitational Potentials on the Spherical and the Ellipsoidal Surfaces. 1992.
Atenció: Aquestes cites poden no estar 100% correctes.