On your image search results page:
Look for this Creative Commons icon
Best Practices for Attribution with examples; from Creative Commons.
American Cartoon Prints, 1800-1899 (from the Library of Congress)
Gilded Age Cartoons (from Rutherford B. Hayes Presidential Library and Museum)
Gilded Age Humor (a digital album of cover images of Puck, weekly humor magazine, on the Library of Congress Flickr account)
Politics in Graphic Detail: Exploring History through Political Cartoons (a digital history exhibit from the Historical Society of Pennsylvania that features political cartoons spanning American history from the colonial period through the Progressive Era.)
Wikimedia Commons (Wikimedia Commons is a free media repository of over 58 million freely usable items)
Digital Public Library of America (more than 37 million free-to-use images, texts, videos and sounds held within America’s libraries, archives, museums, and other cultural heritage institutions. Keyword search or explore Browse by Topic, Exhibitions, and Primary Source Sets in the top menu bar. Browse by time period within Primary Source Sets.)
Historical statistics of the United States: earliest times to the present . (This PDF of the print reference source contains tables of statistics on a range of topics such as population, migration, labor, and business enterprise from Census.gov, the website of the U.S. Census Bureau)
Library of Congress: Prints and Photographs Online Catalog: Search by the subject/contents of the photograph/print and date for best results. If you start typing a date, a series of suggested dates and/or date ranges will pop up. If you need any help, please ask a Librarian!
Library of Congress Albums on Flickr
The New York Public Library Digital Images Collection (Be sure to check "Search only public domain materials" when you search this digital collection of 881,097 prints, photographs, maps, and more.)
The Opper Project: Lesson Plans (A topically arranged collection of historic editorial cartoons covering more than 100 years of American history from The Ohio State University Billy Ireland Cartoon Library & Museum. Cartoons are in the public domain unless otherwise noted.)
Public Domain Images from the National Archives (This set features images from the U.S. National Archives that are believed to be in the public domain. As NARA explains: "The vast majority of digitized historical documents and photographs in ARC are in the public domain. Therefore, no written permission is required to use them. We would appreciate your crediting the National Archives and Records Administration as the original source. For the few that remain copyrighted, please read the instructions noted in the description for the digital image.)
Wikimedia Commons: United States by Century (Wikimedia Commons is a free media repository of over 58 million freely usable items)
NOTE: If you are using an image in a slide presentation, you will cite it on the slide upon which it appears, rather than in the bibliography of your project.
To cite an image , choose the option that best describes where you found it:
Next you will choose the type of image you are citing. For instance, a cartoon or comic strip, map or chart, photo or illustration, or work of visual art.
To cite an video clip, choose the option that best describes where you found it:
Database = a Taft Subscription Database such as Classroom Video on Demand.
Website = a website like YouTube.
SEE ALSO Best Practices for Attribution with examples; from Creative Commons.