https://www.flipsnack.com/EBA7B6ED75E/la-voz-fijada

https://www.academia.edu/145418865/LA_VOZ_FIJADA

https://www.flipsnack.com/EBA7B6ED75E/anexos-i-y-ii

Fonoautografo 1860

https://discospm.bandcamp.com/album/aparador-sonor