Below are trustworthy websites that will help you write clearly and cite correctly:
Resources at the New York Public Library (NYPL) are free and available to NYC-area residents:
Below are search terms that may lead you to books on ESL/ELI education in the library catalog:
ESL
English as a second language
English as a foreign language
English language learners
Bilingualism
Language and education
Second language acquisition
Education, Bilingual
Language acquisition