Teaching and learning at a distance :  foundations of distance education / 
Michael Simonson [y otros tres] 
 - 5th ed. 
 - xxiv, 383 páginas :  ilustraciones 
<br/><br/><label>ISBN: </label>9780132487313 (papel alcalino) 0132487314 (papel alcalino) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educación a distancia
<br/><br/><label>LC Class. No.: </label>LC5800  / T435 2012