APA

Walliams. David, Ross T., . (2016). The World's Worst Children. London: Harper Collins.

Chicago

Walliams. David, Ross Tony, . 2016. The World's Worst Children. London: Harper Collins.

Harvard

Walliams. David, Ross T., . (2016). The World's Worst Children. London: Harper Collins.

MLA

Walliams. David, Ross Tony, . The World's Worst Children. London: Harper Collins. 2016.