10-12 pagesgeneral information, advantages and disadvantages, types and the differences and so on included graphs and tables 5 or 6 refrences MOST IMPORTANT no direct copy from other resources you can summarize or paraphraseas we discussed total 9 pages ( 6 of them the text and the other three will be filled with graphs tables charts ) so i will get 9 pagesthe 10th page for the citation