Marr, W. A. (1999). Nondestructive and Automated Testing for Soil and Rock Properties. ASTM.
Cita Chicago (17th ed.)Marr, W. A. Nondestructive and Automated Testing for Soil and Rock Properties. West Conshohockern, P. A: ASTM, 1999.
Cita MLA (9th ed.)Marr, W. A. Nondestructive and Automated Testing for Soil and Rock Properties. ASTM, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.