The first is MLK and The Montgomery Story from Fellowship of Reconciliation (December 1957). Comics.org states that Benton Resnick wrote the script, but other then that the credits are virtually unknown.
The second book is The Life Of Martin Luther King Jr. from Golden Legacy. There are a total of 16 comic book biographies of acclaimed African American historical heroes. The MLK book is the only own you can view online in full, but you can buy them all as hardcovers and teachers can even purchase an educational guide book.