Not for research, just for pleasure reading. Thanks.
Carl Sandberg Prairie and Wars years volumes are a great read and well told.
This one's going to be a little specific but you still might like it: Lincoln's Melancholy: How Depression Challenged a President and Fueled His Greatness
I realize I'm a bit late to the party here, but I'll add a few works that also may be of interest.
Lincoln by the late David Herbert Donald is often considered one of the greatest single volume, cradle-to-grave biographies of Lincoln.
Lincoln's Battle with God by Stephen Mansfield is a nice popular work if you're searching for insights on Lincoln's religion.
Abraham Lincoln: Redeemer President by Allen Guelzo is focused on Lincoln as a man of ideas.
Abraham Lincoln: A Life by Michael Burlingame is a two volume, lengthy cradle-to-grave. It's more recent than Donald's work. You can find a free, unedited version of the original manuscript here: https://www.knox.edu/about-knox/lincoln-studies-center/burlingame-abraham-lincoln-a-life
The Fiery Trial: Abraham Lincoln & American Slavery by Eric Foner is another somewhat recent work of interest.
What one should bear in mind is that none of these should be taken as irrefutable truth. Always remember to think critically and challenge assumptions, whether they're made by academics like Foner or popular historians like Mansfield.
The Lincoln field is vast. There are literally thousands of books on the man and his era, so you'll not soon run out of reading material. Though I haven't mentioned his works here, I'd recommend looking into Harold Holzer's many books as well.