Naturalist artlangers are likely to find interesting this paper: van Driem, George. 2007. 'A holistic approach to the fine art of grammar writing: The Dallas Manifesto'. <http://www.himalayanlanguages.org/files/driem/pdfs/2007DallasManifesto.pdf> It's half a ranty manifesto that will chime with many conlangers' prejudices, and half a study of evidentiality in a Tibeto-Burman language. --And.