Elbert, J.D <br/><br/>
Interacting systems in development 

 - 2nd ed. 
 - New York  Holt, Rinehart  1970 
 - x, 338p.  ill. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Development
<br/><br/><label>LC Class. No.: </label>MED QL955  / E2