Educational Research  Quantitative, Qualitative and mixed Approaches /  [electronic resource] : 
R. Burke Johnson. 
 - 7th Edition. 
 - Washington DC :  Sage Publications, Inc,  c2020. 
 - 1840 pages. 
<br/><br/><label>ISBN: </label>978-1-544-33783-8 
<br/><br/><label>LCCN: </label>2019020136