Every fact, figure, or idea from an outside source must have both an in-text citation and be listed on the Works Cited page. To create In-text citations in MLA:
The source has more credibility if you can name the author:
If you write a paragraph that pulls more than once from the same page of the same source—and no other source is quoted—you may use a single parenthesis after the last referral to that source.
When you cite a survey or questionnaire in your paper, put down the name of the person conducting the survey with last name first, first name last, followed by the name of the survey in quotation marks. Next, identify it as a survey or questionnaire followed by the date, the survey, or questionnaire was conducted.