Hibbeler, R.C <br/><br/>
Estatica 

 - 2a ed 
 -  Continental S.A,   1989 
<br/><br/>1989 
<br/><br/><label>ISBN: </label>978-968-26-0818-6 
<br/><br/><label>Subjects--Index Terms: </label>Sistemas 
<br/><br/><label>Dewey Class. No.: </label>620.066 -