Julia Alvarez: Official Author Site
This is a site curated by the author herself, with descriptions of her work, news about appearances, and methods for contacting her, which will be helpful for any student who feels particularly interested in the novel and wishes to learn more about Alvarez.
Julia Alvarez biography
http://www.notablebiographies.com/A-An/Alvarez-Julia.html
An interesting account of Alvarez's background, albeit brief.
Julia Alvarez
http://www.identitytheory.com/julia-alvarez/
A lengthy and somewhat insiderish interview with the author. It is worth reading for her explanation of how she writes, more so than what she writes.