TY  - BOOK
AU  - Warren,J.W.
TI  - Understanding force : : an account of some aspects of teaching the idea of force in school,college and university courses in engineering,m athematics and science / 
U1  - 531.11307 WAR 
PY  - 1979///
CY  - London : 
PB  - John Murray , 
KW  - Force and energy
KW  - Study and teaching
ER  -