Clauson (1972)
An etimological dictionary of pre-thirteenth-century Turkish
p. 534
tört
(? dö:rd) ‘four’; c.i.a.p.a.l.; in NE Tm. dört; SW Az. dörd, Osm. dört, Tkm. dö:rt. A long vowel before a final consonantal cluster is very unusual, but may exist in this word in view of the Tkm. form. Türkü viii; viii ff. (including Man.) tört is common: Uyğ. viii ff. Man.-A; Man.; Bud.; Civ. tört is common: Xak. xi tört yarma:k ‘four dirhams’; also ‘four’ of anything else; also (pronounced) tö:rt, the form with -ö:- is better (al-acwad) Kaş. I 341; a.o.o.: KB tört is common: xiii(?) At. tört 31; Tef. tört 310: xiv Muh. ‘four’ dö:rd Mel. 81, 6; tö:rt Rif. 186; dābbatu’l-arba‘a ‘quadruped’ dö:rt aya:klı: 138 (only; MS. ya:kn): Çağ. xv ff. tört/törter ‘four’ San. 172r. 21 (followed by several phrs.): Xwar. xiii(?) tört (or dörd?) Oğ. 103-7: xiv tört Qutb 184; MN 439; Nahc. 2, 11, etc.: Kom. xiv ‘four’ tört/dört (sic, d- very rare in Kom.) CCG; Gr.: Kıp. xiii ‘four’ dö:rt Hou. 22, 4: xiv dörd İd. 22 (s.v. altağu:); tört do. 38; Bul. 12, 10: xv dört Kav. 65, 6; Tuh. 60b. 7 a.o.o.: Osm. xiv ff. dört in various phr. and der. f.’s TTS I 225; II 321; IV 243.