R. C. Hibbeler,
Statics and Mechanics of Materials
, eds. David Johnstone and John Griffin (New York, Macmillan Publishing Company, 1993) p. 342.
R.
C. Hibbeler, Statics and Mechanics of Materials, eds. David Johnstone and John Griffin (New York, Macmillan Publishing Company, 1993) p. 342.