Check Amazon.com for
Dominican Cookbook by Maria Ramirez de Carias
Also, some years back bought "Caribbean Cooking" by Devra Dedeaux. The chef of this book is Dominican and while several restaurants are from other islands, they have a distinct Dominican flavor. There are many Dominican food recipes, many of which I have prepared here in Santo Domingo.
For Dominican food recipes, do a search of this message board archives, typing in recipes, Dominican food...
Also see the link below