TY  - BOOK
AU  - Malhotra, O.P.
AU  - Gupta, S.K.
AU  - Gangal, Anubhuti.
TI  - BHSEC mathematics book I for class XI : For Class XI students of Bhutan. 
SN  - 9788121932592
U1  - ET 
PY  - 2013///
CY  - New Delhi
PB  - S. Chand & Company Pvt. Ltd., 
ER  -