Nawat Language and the Pipil Indian Tribe - Pronunciation guide, language learning worksheets, and cultural information. - http://www.native-languages.org/pipil.htm
Ethnologue: Pipil - Basic demographic and linguistic information. - http://www.ethnologue.com/show_language.asp?code=ppl
Nawat Language Program - Online language lessons in Nawat (Pipil.) - http://www.computing.dcu.ie/~mward/nawat/general/html/intro_eng.html
Wikipedia: Pipil - Article including dialect information and tribal history. - http://en.wikipedia.org/wiki/Pipil