APA Edition Citation

Brien,Derek O. (2003). GK with Derek 1: History and geography. Penguin Books.

Chicago Edition Citation

Brien,Derek O. GK with Derek 1: History and Geography. New Delhi: Penguin Books, 2003.

MLA Edition Citation

Brien,Derek O. GK with Derek 1: History and Geography. Penguin Books, 2003.

Warning: These citations may not always be 100% accurate.