Since, as far as we know, none of you are 400 years old nor have access to a time machine, you need to give credit to the sources where you found your information. This includes books, articles, and web sites. Here's how to write them in your bibliography/works cited page using MLA 8style, per the Purdue Online Writing Lab. Email Ms. Moore at firstname.lastname@example.org you have any questions or if you find a source type that isn't listed below.
Author. Book title. Publisher, Publication date.
Waters, Kate. Sarah Morton's Day: A Day in the Life of a Pilgrim Girl. Scholastic, 1989.
Author. "Article title." Name of encyclopedia. Publisher, Publication date. (Note: If accessed online, include the date).
Morris, Michelle. "Mayflower Compact." World Book Student. World Book, 2016. Accessed 11 Nov. 2016.
Magazine Article found on Explora
Author. "Article title." Magazine name, vol. X, no. X, year, pages. (Note: This can be scooped up from the results page and reformatted.) Explora. Accessed DD Month YYYY.
Author. "Article title." Web site name, URL. Accessed DD Month YYYY.
Johnson, Caleb. "The Wampanoag." MayflowerHistory.com, http://mayflowerhistory.com/wampanoag. Accessed 11 Nov. 2016.
Author. "Name of video." Web site where you found it, uploaded by Uploader, date, URL.
"Bet You Didn't Know: Thanksgiving." History.com, 2011, http://www.history.com/topics/thanksgiving/first-thanksgiving-meal.
"Bet You Didn't Know: Thanksgiving." Youtube, uploaded by HISTORY, 19 Nov. 2012, https://www.youtube.com/watch?v=H9NDuxL4WA4.
NOTE: To use these free resources, you must be using a computer with a Rhode Island IP address.
Each article gives you its citation at the end, and you can also access images, videos, and links to related articles.
You can narrow your search results to "magazines" and look for Cobblestone and Scholastic, which are written for students. American History and Smithsonian are also very good, although they'll be a little harder to read.
NOTE: Ms. Moore checked out all of these sites, and they're legit! If you find other sites on your own, be sure to evaluate them for credibility before using the for your research. You can also send the URL to Ms. Moore at email@example.com, and she can let you know whether it's good to use for school.