When I Was Puerto Rican Esmeralda Santiago is a memoir of the author's experiences on the island of Puerto Rico and the transition that she had to make when moving to New York City. She tackles the topics of bilingualism and assimilation in her story.
Even better is Judith Cofer Ortiz's Silent Dancing: A Partial Remembrance of a Puerto Rican Childhood. In this memoir, Ortiz moves back and forth between her childhood in Puerto Rico and her transition to New Jersey.
In the realm of fiction, Yo! by Julia Alvarez is the sequel to How the Garcia Girls Lost Their Accents and continues Yolanda's story.