APA
,, . (2006). Biology : Textbook for class XI. New Delhi: N C E R T.
Chicago
,, . 2006. Biology : Textbook for class XI. New Delhi: N C E R T.
Harvard
,, . (2006). Biology : Textbook for class XI. New Delhi: N C E R T.
MLA
,, . Biology : Textbook for class XI. New Delhi: N C E R T. 2006.