מומנט התמד פולרי של השטח – הבדלי גרסאות

*Irving H. Shames, Engineering Mechanics, Prentic - Hall InternationalInc, London, 1970. {{ISBN|}} 0-13-279216-8

*McGraw-Hill Encyclopedia of Engineering, Sybil P. Parker Editor in Chieh. McGraw-Hill, 1983. {{ISBN|}} 0-07-0454868

*Mechanical Engineering Design, Joseph E. Shigley, Larry D. Mitchell, 4th Edition 1983. {{ISBN|}} 0-07-056888-x