Tham khảo Ngón_tay

  • The Chambers Dictionary. Edinburgh: Chambers Harrap Publishers Ltd. 2000 [1998]. ISBN 0-550-14000-X
  • The Oxford Illustrated Dictionary. Great Britain: Oxford University Press. 1976 [1975]. 
  • Oxford Advanced Learner's Dictionary of Current English. London: Oxford University Press. 1974 [1974]. ISBN 0-19-431102-3