To cite image sources in a works cited list, consult UNBC's Academic Success Centre's help for Referencing and Citations. They offer guides for MLA, APA, and other styles. To credit a photo from these sites, always check the terms and conditions for the individual photo, if available, and link or mention the source institution (Image Gallery, Artefacts Canada, etc.) and the creator, if given, where the image appears in your document.
From the Google images page, choose from the drop-down Search Tools bar a license filter for "reuse" or "non-commercial reuse". The resulting images will have a creative commons license which allows the type of use you've specified.
The Artefacts Canada database contains close to 5 million object records and approximately 1 million images from Canadian museums. Includes a Humanities and a Natural Sciences database.
Flickr Commons - search and use hundreds of images with little or no copyright restrictions. A joint venture of Flickr and the Library of Congress. Contains collections from such institutions as the Smithsonian, the New York Public Library, the Getty Research Institute, and the Royal Library of Denmark to name a few. To review the explicit rights statement for any image, please click on the relevant link under "participating institutions" or on the "no known copyright restrictions" link associated with the image in the Commons. Cite the image according to the format your instructor prefers (MLA, APA, etc.)
Free Images UK is an archive of stock photography for use in websites, printed materials and products. Images are provided free of charge for both commercial and personal use under an attribution license. All images in the collection are free to use on websites, printed materials and anywhere you need photos for illustration and design use. Check Terms of image.
Google's Art Project is a collaboration between Google and 151 acclaimed art partners from across 40 countries. Allows users to explore museums from around the world online, discover and view hundreds of artworks at brushstroke levels, and create and share their own collections. Over 30,000 works of art from sculpture to architecture and drawings presented in high resolution imagery. Artworks featured on the art project site are owned by the museums, and these images may be subject to copyright laws around the world. The Art Project encourages classroom use, but states that users may not print the images, except for the educational materials provided.
Chronicling America is a website providing access to information about historic U.S. newspapers and select digitized newspaper pages, and is produced by the National Digital Newspaper Program (NDNP). NDNP, a partnership between the National Endowment for the Humanities (NEH) and the Library of Congress (LC), is a long-term effort to develop an Internet-based, searchable database of U.S. newspapers with descriptive information and select digitization of historic pages.
Wikimedia Commons is a media file repository making available public domain and freely-licensed educational media content (images, sound and video clips) to everyone. Unlike traditional media repositories, Wikimedia Commons is free. Everyone is allowed to copy, use and modify any files here freely as long as they follow the terms specified by the author; this often means crediting the source and author(s) appropriately and releasing copies/improvements under the same freedom to others. The license conditions of each individual media file can be found on their description page.
Created by UNESCO the World Digital Library makes available on the Internet, free of charge and in multilingual format, significant primary materials from countries and cultures around the world. The WDL aims to promote international and intercultural understanding; expand the volume and variety of cultural content on the Internet; provide resources for educators, scholars, and general audiences; and build capacity in partner institutions to narrow the digital divide between countries.