# good textbook to self-learn systems of ODEs

I've taken regular Ordinary Differential Equations. Right now I'm taking Systems of ODEs and the textbook is less than stellar. I was wondering if anyone could point me to a decent self-study book for the subject.

Systems of ODEs: matrices composed of regular ODEs

Example: $\frac{d}{dt}\bigl(\begin{smallmatrix} x\\ y \end{smallmatrix} \bigr)=\bigl(\begin{smallmatrix} a&b\\ c&d \end{smallmatrix} \bigr)\bigl(\begin{smallmatrix} x\\ y \end{smallmatrix} \bigr)$ Thanks! ^_^