1. “Building code requirements for reinforced concrete and commentary (ACI 318-89/318R-89/318M-89).” (1989). ACI Committee 318 American Concrete Institute Detroit Mich.
2. CEB-FIP Model code 1990.” (1993). Committee Euro-International du Beton (CEB-FIP) Thomas Telford London 34–36.
3. Mehta P. K. and Monteiro P. J. M. (1993). Concrete Prentice-Hall Inc. Englewood Cliffs N.J. 93–101.