TY  - BOOK
AU  - Singh,Y.K..
AU  - Sharma, T.K..
AU  - Upadhya, B..
TI  - Educational technology :
SN  - 978-81-313-0362-7
U1  - 371.33 SIN 
CY  - New Delhi
N1  - Includes bibliographical references and index
ER  -