I my thesis I have to cite the following standard result:
Let $Y$ be a compact Riemann surface and let $B\subseteq Y$ be a finite subset. Given a natural number $d$, there are only finitely many isomorphism classes of (holomorphic) coverings $f:X\longrightarrow Y$ of degree $d$ and with branch locus contained in $B$.
I need a reference (also a paper), different from Rick Miranda's book, in which this theorem is proved.
Remark: I think that Miranda's book is a beautiful reference for Riemann surfaces, simply I don't like how the above theorem is presented. In general I'm not comfortable with theorems whose statements are given after the proofs.
Thanks in advance.