Clauson (1972)
An etimological dictionary of pre-thirteenth-century Turkish
p. 130
altı:
‘six’; c.i.a.p.a.l.; common in Türkü viii: Uyğ. viii, viii ff. Bud.: xiv Chin.-Uyğ. Dict. Ligeti 128: O. Kır. ix ff.: Xak. xi and KB: xiii(?) Tef.: xiv Muh.: Çağ. xv ff.: Xwar. Qutb; MN; Nahc.: Kom. xiv: Kıp. xiii-xv: Osm. xiv ff.