MLA Style (OWL at Purdue)(2020) Please Note: The written material on this university website is still a good resource, but please ignore the citation generator advertised on (seemingly) every page. In 2019, Purdue Writing Lab partnered with Chegg, a for-profit student services company. Chegg has licensed OWL’s writing tips and placed advertising on its website, helping OWL to monetize its free content.