Head, K.H. (2006). Manual of Soil Laboratory Testing, Volume 1 - Soil Classification and Compaction Tests (3rd Edition). Whittles Publishing. ISBN 19-044-4536-5 .
Head, K. H. Epps, R. J. (2011). Manual of Soil Laboratory Testing, Volume 2: Permeability, Shear Strength and Compressibility Tests (3rd Edition). Whittles Publishing. ISBN 978-184-9951-111 .
HEAD, K.H. a R.J. EPPS. (2013). Manual of soil laboratory testing: Volume III. 3rd edition. Dunbeath: Whittles Publishing. ISBN 978-184-9950-541 .