# looking for reference on dihedral, tetrahedral, or octahedral forms

I am looking for a reference on dihedral, tetrahedral, or octahedral forms. As far as I read, they are some cuspidal automorphic forms on $GL(2)$ induced from $GL(1)$. Dihedral is from $GL(1)/K$ to $GL(2)/\mathbb{Q}$, where $K$ is a quadratic extension of $\mathbb{Q}$. But is this the same for tetrahedral or octahedral forms? What's their constructions?