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.