ɪt wʌz fˈɜːst pˈʌblɪʃt ɪnðə mˈeɪ nˈaɪntiːnhˈʌndɹɪd fˈɪfti sˈɪks ˈɪʃuː ʌv sˈaɪəns fˈɪkʃən ænd ɹᵻpɹˈɪntᵻd ɪnðə nˈaɪntiːnhˈʌndɹɪd fˈɪfti sˈɛvən kəlˈɛkʃən ˈɜːθ ɪz ɹˈuːm ɪnˈʌf.
It was first published in the May 1956  issue of Science Fiction and reprinted in the 1957  collection Earth Is Room Enough.