Writing an essay considers using numerous sources including books, magazines, articles, web pages and more. Reference materials are the key element of any academic paper. They appear to be the main background of your essay. It means that you should opt for the most reputable and trustworthy sources to support your idea. Moreover, in the majority of cases you will need to stick to the instructions providing a particular number of sources. It will hardly put an ease on your schedule. will deliver a necessary number of the most reliable sources related to the topic. All you need is to look them through.