APA

Gupta S. P., . (2005). Statistical methods. : Sultan Chand & Sons, New Delhi.

Chicago

Gupta S P, . 2005. Statistical methods. : Sultan Chand & Sons, New Delhi.

Harvard

Gupta S. P., . (2005). Statistical methods. : Sultan Chand & Sons, New Delhi.

MLA

Gupta S P, . Statistical methods. : Sultan Chand & Sons, New Delhi. 2005.