Krajcik, Joseph S. <br/><br/>
Teaching science in elementary and middle school :  a project-based approach / 
by Joseph Krajcik and Charlene Czerniak. 
 - Fourth edition. 
 - xvi, 403 pages :  illustrations ;  26 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780415534048 (hardback)  RM429.29 9780415534055 9780203113660 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching (Elementary)--Methodology.<br/>Science--Study and teaching (Middle school)--Methodology.