ðɪ ˌɔːɹɡɐnᵻzˈeɪʃənz mˈoʊst wˈɛlnˈoʊn bˈʊk ɪz ɪts dˌɛfɪnˈɪʃən mˈænjuːəl, fˈɜːst pˈʌblɪʃt ɪn nˈaɪntiːnhˈʌndɹɪd tˈɛn ænd nˈaʊ ɪn ɪts twˈɛlfθ ᵻdˈɪʃən: ˌɪntəlˈɛktʃuːəl dˌɪsɐbˈɪləɾi: dˌɛfɪnˈɪʃən, dˌaɪəɡnˈoʊsɪs, klˌæsɪfɪkˈeɪʃən, ænd sˈɪstəmz ʌv səpˈoːɹt.
The organization's most well-known book is its definition manual, first published in 1910 and now in its 12th edition: Intellectual Disability: Definition, Diagnosis, Classification, and Systems of Support.