1. ASTM C143 Standard Test Method for Slump of Hydraulic Cement Concrete (2003) ASTM International (formerly American Society for Testing and Materials).
2. ASTM C939 Standard Test Method for Flow of Grout for Preplaced Aggregate Concrete (Flow Cone Method) (2002) ASTM International (formerly American Society for Testing and Materials).
3. Jayawickrama Priyantha W. Yajai Tinkey Jie Gong and John Turner (2007) "Nondestructive Evaluation of Installed Soil Nails " Final Research Report Submitted to Texas Department of Transportation Report No. FHWA/TX-0-4484-R1 December 2007.
4. Porterfield J.A. Cotton D.M. Byrne (1994) Soil Nailing Inspectors' Manual Federal Highway Administration Washington D.C. FHWA-SA-93-068.