Hanson, N. W. <br/><br/>
Concrete beams and columns with bundled reinforcement / by -N. W. Hanson and Hans Reiffenstuhl. 

 - Skokie, Illinois : atories, Development Department 
 - 23 p. 
 - Bulletin D25 / Portland Cement Association, Research and De-velopment Laboratories, Development Department .
<br/><br/> "Reprinted from the Journal of the Structural Division, Pro-ceedings of the American Society of Civil Engineers, Proc. - Paper 1818, vol. 84, No. ST6, October, 1958."