Handbook of research on educational communications and technology / 
J. Michael Spector, M. David Merrill, Jan Elen, M.J. Bishop, editors. 
 - Fourth edition. 
 - xxxv, 1005 pages :  illustrations ;  29 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/><label>ISBN: </label>9781461431848  RM972.74 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology--Research--Handbooks, manuals, etc.<br/>Communication in education--Research--Handbooks, manuals, etc.<br/>Telecommunication in education--Research--Handbooks, manuals, etc.<br/>Instructional systems--Design--Research--Handbooks, manuals, etc.