Aked, C. K. (1977). A conspectus of electrical timekeeping (1ª ed.). Wadhurst, Sussex: The Antiquarian Horological Society.
Cita MLA (8 ed.) (Copiar al portapapeles)Aked, Charles K. A Conspectus of Electrical Timekeeping. 1ª ed. Wadhurst, Sussex: The Antiquarian Horological Society , 1977.