John Heresy wrote a factual novel called Hiroshima. He isn't Asian American, but the accounts he includes in his novel are from Japanese people who were there when the bomb was dropped on Hiroshima. The book is divided into different essays (articles) so you can pick and choose which ones to teach if you wanted.
Also, there's an anthology called Only What We Could Carry that works well with Farewell to Manzanar because it has a large collection of letters, documents, art, and even propaganda about the Japanese American internment during WWII. It's good to use as supplemental material when teaching about the Japanese internment and/or Farewell to Manzanar.