Ape Language,"Interactive Lexigram"存档副本. [2007-03-15]. (原始内容存档于2010-05-20). , Great Ape Trust, 2010. von Glasersfeld, E. (1974) The Yerkish language for
simplificate, initialmente publicate in 1951 per International Auxiliary Language Association. Appellate a vices Interlingua de IALA pro distinguer lo del