Harvard Citation

Gaarder, J., & Møller, P., 2015. Sophie's world (20th anniversary edition.). London: Weidenfeld & Nicolson.

APA Citation

Gaarder, J., & Møller, P. (2015). Sophie's world (20th anniversary edition.). London: Weidenfeld & Nicolson.

Chicago Style Citation

Gaarder, Jostein, and Paulette Møller. Sophie's World. 20th anniversary edition. London: Weidenfeld & Nicolson, 2015.

MLA Citation

Gaarder, Jostein, and Paulette Møller. Sophie's World. 20th anniversary edition. London: Weidenfeld & Nicolson, 2015.

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