WestLaw is a great resource for doing research on the many of the people who were influential durng Lincoln's presidency, especially cabinet members, and Supreme Court Justices.
There are many people and events that have been written about from the presidency of Lincoln.
EBSCO Acadedmic Search Complete
Ebsco contains a wealth of resources and scholarly discussions concerning Lincoln's presidency, and the people of Lincoln's cabinet.
JSTOR Scholarly articles focusing primarily on the Humanities, including history.
Paulsen, Michael Stokes. (2008) Lincoln and Judicial Authority, 83 NOTRE Dame L. REV. 1227
Sutherland Jr., Arthur E. (1951) Constitutional Problems Under Lincoln: The Supreme Court and the Commander in Chief. Harvard Law Review, Dec1951, Vol. 65 Issue 2, p373-376, 4p; Lincoln and the Court Harvard Law Review, Jan2009, Vol. 122 Issue 3, p1047-1047, 1/2p
Hanging Captain Gordon. Ron Soodalter. Civil War Times. Harrisburg: Aug 2009. Vol. 48, Iss. 4; pg. 46, 8 pgs