Libraries and archives around the world are making historic documents available for research from anywhere by digitizing original, primary source materials and putting them online. Using primary sources online is a great way to give your research more depth and make your resulting paper or project more interesting.
It is import to correctly cite a primary source accessed online. That way readers will know the source of the information and that you found it on a reliable website. Include in citations the author, title and date of the original document, the title of the website where the item was found, publisher of the digital item (or producer of the website,) date you accessed the website and the URL.
Here are some examples:
Nusbaum, Jesse, "Adobe Building on Canyon Road, Santa Fe, New Mexico," 1912, New Mexico's Digital Collections, Photo Archives, Palace of the Governors, Santa Fe, accessed Oct. 17, 2011, http://econtent.unm.edu/u?/nusbaum,2380.
Lobato, Julian, "Letter from Pueblo of Santo Domingo to Indian Agent," n.d., New Mexico's Digital Collections, Center for Southwest Research, University Libraries, University of New Mexico, accessed Oct. 17, 2011, http://econtent.unm.edu/u?/indaffairs,934.
"And Don't You Forget It," Deming Headlight, March 9, 1901, Chronicling America: Historic American Newspapers, Library of Congress, accessed October 12, 2011, http://chroniclingamerica.loc.gov/lccn/sn83004264/1901-03-09/ed-1/seq-1/.