The language in your paper must either be your own or a direct quote from the original source.
Footnotes acknowledge that the fact or opinion expressed comes from another writer.
If the language comes from another writer, quotation marks are necessary in addition to a footnote. Now for a detailed example. In 1925 Dreiser produced his masterpiece, the massively impressive An American Tragedy . He was seen as the most powerful and effective destroyer of the genteel tradition that had dominated popular American fiction in the post-Civil War period, spreading its soft blanket of provincial, sentimental romance over the often ugly realities of life in modern, industrialized, urban America. Certainly there was nothing genteel about Dreiser, either as man or novelist.