SIL Peru's site for Yaneshaʼ: http://www.sil.org/americas/peru/html/pubs/pub_index_list.asp?sortby=lang&name=Yanesha%C2%B4%20(Amuesha)
Dictionary: http://www.sil.org/americas/peru/html/pubs/show_work.asp?id=601
Grammar: http://www.sil.org/americas/peru/html/pubs/show_work.asp?id=597
Orthography: http://www.sil.org/americas/peru/html/pubs/show_work.asp?id=3213
Besides the usual latin letters (some used in digraphs), the Yaneshaʼ orthography uses an apostrophe to write a glotal stop. This is best represented using U+02BC ʼ MODIFIER LETTER APOSTROPHE.