1. AASHTO
(1990). Task Force 27 Report In Situ Soil Improvement Techniques AASHTO-AGC-ARTBA subcommittee on New Highway Materials Washington pp. 4-38.
2. AASHTO
(1991). Standard Specifications for Highway Bridges 1991 Interims American Association of State Highway and Transportation Officials Washington DC.
3. AASHTO
(1997). Standard Specifications for Highway Bridges 1997 Interims American Association of State Highway and Transportation Officials Washington DC.
4. AASHTO
(2009). LRFD Bridge Design Specifications 2009 Interims American Association of State Highway and Transportation Officials Washington DC.