TY  - BOOK
AU  - Shakoori, A. R.
AU  - Aziz, Wahab Akhtar
AU  - Siddiqui, M. Rehan
TI  - Textbook of biology: Class XI 
U1  - 570.7 21
PY  - 1999///
CY  - Lahore
PB  - Punjab Text Book Board
KW  - Biology
N1  - Includes glossary
ER  -