• Thai-English English-Thai Dictionary for Non-Thai Speakers, Revised Edition by Benjawan Poomsan Becker 
    Paperback dictionary written in Thai with 658 pages.
    Paiboon Publishing; Revised edition (January 1, 2002)
    This is the best Thai dictionary that I found anywhere.
  • Robertson’s Practical English-Thai Dictionary by Richard G. Robertson 
    Paperback dictionary written in English with 317 pages.
    Tuttle Publishing (June 1, 1969)
    Excellent for looking up basic vocabulary and ideas.
  • Oxford-River Books English-Thai Dictionary by Prima Mallikamas (Editor), Narisa Chakrabongse (Editor), Paisarn Piammattawat (Editor) 
    Hardback dictionary written in English with 1079 pages.
    Oxford University Press; Bilingual edition (April 1, 2005)
    Very useful!
  • Rough Guide to Thai Dictionary Phrasebook 2 : Dictionary Phrasebook (Rough Guide Phrasebooks) by Lexus 
    Paperback dictionary written in English with 288 pages.
    Rough Guides (January 1, 2000)
    Best Thai language pocket/reference book plus great price.
  • Thai-English Dictionary by George Bradley McFarland 
    Hardback dictionary written in English.
    Stanford University Press (February 1, 1985)
    Still the best.