1. “Hollow Load‐Bearing Concrete Masonry Units ” American Society for Testing and Materials ASTM C90‐75 Philadelphia Pa.
2. “Mortar for Unit Masonry ” American Society for Testing and Materials ASTM C270‐73 Philadelphia Pa.
3. “Mortar and Grout for Reinforced Masonry ” American Society for Testing and Materials ASTM C476‐71 Philadelphia Pa.
4. “Grout for Concrete Masonry Walls ” National Concrete Masonry Association NCMA‐TEK 23A Herndon Va.
5. “Building Code Requirements for Concrete Masonry Structures (ACI 531‐79) ” ACI Committee 531 American Concrete Institute Detroit 1979 p. 47.