I would love to know some good refercences about Elliptic curves over function fields. Especially in view with Mordell-Weil's Theorem. I am already familiar with the main proof of Mordell's theorem in the book "Rational Points on Elliptic Curves" by Silverman-Tate, thus I am already familiar with the case over $\mathbb{Q}$.
Does anyone have any suggestions?
There are fairly detailed notes by Douglas Ulmer available online. They cover the important case of function fields over finite fields. I couldn't tell if this is the case that interest you.