Ethnologue: Arapaho - Basic demographic and linguistic information. - http://www.ethnologue.com/show_language.asp?code=arp
Wikipedia: Arapaho Language - Article on the Arapaho language including a phonological inventory. - http://en.wikipedia.org/wiki/Arapaho_language
Blue Sky People - Interview with an Arapaho elder on the importance of language preservation. - http://www.uatuahine.hawaii.edu/hana/si98/singer/default.html
Arapaho Language (Arapahoe, Inuna-Ina) - Pronunciation guide, language learning worksheets, and cultural information. - http://www.native-languages.org/arapaho.htm
Teaching Arapaho Language Through Immersion - Essay on Arapaho and other indigenous language preservation efforts by Stephen Greymorning. - http://jan.ucc.nau.edu/~jar/TIL_3.html