Perry, J. (1910). Spinning tops: The "Operatives' lecture" of the British Association meeting at Leeds, 6th September 1890 (Reprint of new & rev. ed.). Society for Promoting Christian Knowledge; E. S. Gorham.
Lua i Stíl Chicago (17ú heag.)Perry, John. Spinning Tops: The "Operatives' Lecture" of the British Association Meeting at Leeds, 6th September 1890. Reprint of new & rev. ed. London, New York: Society for Promoting Christian Knowledge; E. S. Gorham, 1910.
Lua MLA (8ú heag.)Perry, John. Spinning Tops: The "Operatives' Lecture" of the British Association Meeting at Leeds, 6th September 1890. Reprint of new & rev. ed. Society for Promoting Christian Knowledge; E. S. Gorham, 1910.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.