Romero, Roberto R. <br/><br/>
Grupo  objeto y teoría 
Roberto R. Romero. 
 - 3a ed. 
 - Buenos Aires  Lugar Editorial  c1994. 
 - 174 p.  ill.  20 cm. 
<br/><br/> Limited cataloging. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9509129593 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>8906509  DNLM 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Group Processes.
<br/><br/><label>Dewey Class. No.: </label>121  / R7634g3 
<br/><br/><label>National Library of Medicine Call No.: </label>GG1661  [HM 131]