Charles Head Norris, John Benson Wilbur, . (1960). Elementary Structural Analysis. New York: McGRAW HILL.
Charles Head Norris, John Benson Wilbur, . 1960. Elementary Structural Analysis. New York: McGRAW HILL.
Charles Head Norris, John Benson Wilbur, . Elementary Structural Analysis. New York: McGRAW HILL. 1960.