Head, K. H., & Epps, R. J. (2014). Manual of soil laboratory testing (Third edition.). Whittles Publishing.
Cita Chicago (17th ed.)Head, K. H., i R. J. Epps. Manual of Soil Laboratory Testing. Third edition. Caithness, Scotland: Whittles Publishing, 2014.
Cita MLA (9th ed.)Head, K. H., i R. J. Epps. Manual of Soil Laboratory Testing. Third edition. Whittles Publishing, 2014.
Atenció: Aquestes cites poden no estar 100% correctes.