Look at the sample.pdf file to have an idea of how it can be done. Opoku and Rupp files are the journal articles for sample.pdf. These are the 5 journal articles I picked for this assignment (please look at guideline if you do not understand). http://www.joams.com/uploadfile/2015/0407/20150407053353490.pdf https://fardapaper.ir/mohavaha/uploads/2019/01/Fardapaper-Willingness-to-pay-more-for-green-products-The-interplay-of-consumer-characteristics-and-customer-participation.pdf https://pdfs.semanticscholar.org/a280/c48f5bfb37c39ee9d6cc7b61c2222d2179d9.pdf https://reshistorica.journals.umcs.pl/ijsr/article/viewFile/334/334 https://www.researchgate.net/profile/Kendall_Park2/publication/322905144_Understanding_ethical_consumers_willingness-to-pay_by_moral_cause/links/5b7ac4e34585151fd1228932/Understanding-ethical-consumers-willingness-to-pay-by-moral-cause.pdf Please do exactly like the sample.pdf format, and please ask me if you don't understand anything.