Krylov, N. (1968). Descriptive geometry. Mir pub.
Cita Chicago (17th ed.)Krylov, N. Descriptive Geometry. Moscow: Mir pub, 1968.
Cita MLA (9th ed.)Krylov, N. Descriptive Geometry. Mir pub, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.