http://amhistory.si.edu/militaryhistory/printable/section.asp?id=7
http://www.britannica.com/EBchecked/topic/558008/Spanish-American-War
https://history.state.gov/milestones/1866-1898/spanish-american-war
http://www.history.com/topics/spanish-american-war
http://www.loc.gov/rr/hispanic/1898/intro.html