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| | Ethnologue: Bibliography of Ethnologue Data Sources |
 | | Hooley, Bruce A. Austronesian languages of the Morobe District, Papua New Guinea. |
 | | Ramponi, E. Religion and divination of the Logbara tribe of North-Uganda. |
 | | Everett, Daniel L. Á língua pirahã e a teoria da sintaxe: descrição, perspectivas, e teoria. |
| www.ethnologue.com /14/ethno_docs/bibliography.asp (7160 words) |
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