อ้างอิง ของ OK

  1. ↑ Beaver, David (20 February 2011). "Not OK". Not OK. สืบค้นเมื่อ 10 December 2014.
  2. ↑ Yngve, Victor. "On getting a word in edgewise," page 568. Papers from the Sixth Regional Meeting [of the] Chicago Linguistic Society, 1970.