ɔnðə mˈɛʒɚmənt ʌv tˌɛknəlˈɑːdʒɪkəl tʃˈeɪndʒ, nˈaɪntiːnhˈʌndɹɪd sˈɪksti wˈʌn, ðɪ ˌiːkənˈɑːmɪk dʒˈɜːnəl sˈɛvənti wˈʌn:tˈuːhˈʌndɹɪd ˈeɪɾi fˈoːɹ dˈɛk., nˈaɪntiːnhˈʌndɹɪd sˈɪksti wˈʌn, sˈɛvənhˈʌndɹɪd nˈaɪn sˈɛvənhˈʌndɹɪd twˈɛnti nˈaɪn. dʒˈeɪstˈoːɹ
On the Measurement of Technological Change, 1961, The Economic Journal 71:284 (Dec., 1961), 709–729. (jstor)