General view (looking northeast) Headquarters Presidio Reservation, San Francisco, California. The Presidio in the 1870's matches ground plan. Triple-story bachelor officer quarter is on right, original Presidio building is left of center in picture (behind horse-drawn wood cart). Alcatraz is at the right edge of the picture in this view to north-northeast down center of the parade ground. At the right of the flag pole is the hospital, dating from 1854 and still at the original site. Post was inspected in 1866 when it had 1,156 officers and men in 16 companies, 14 of them preparing for duty in Arizona."

Chicago citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994. General view (looking northeast) Headquarters Presidio Reservation, San Francisco, California. The Presidio in the 1870's matches ground plan. Triple-story bachelor officer quarter is on right, original Presidio building is left of center in picture (behind horse-drawn wood cart). Alcatraz is at the right edge of the picture in this view to north-northeast down center of the parade ground. At the right of the flag pole is the hospital, dating from 1854 and still at the original site. Post was inspected in 1866 when it had 1,156 officers and men in 16 companies, 14 of them preparing for duty in Arizona.". Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6598344. (Accessed October 20, 2018.)
APA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994, General view (looking northeast) Headquarters Presidio Reservation, San Francisco, California. The Presidio in the 1870's matches ground plan. Triple-story bachelor officer quarter is on right, original Presidio building is left of center in picture (behind horse-drawn wood cart). Alcatraz is at the right edge of the picture in this view to north-northeast down center of the parade ground. At the right of the flag pole is the hospital, dating from 1854 and still at the original site. Post was inspected in 1866 when it had 1,156 officers and men in 16 companies, 14 of them preparing for duty in Arizona.". Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6598344
MLA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/6598344>.
Note: These citations are programmatically generated and may be incomplete.