Potter, Charles Francis..
Can you Say These tongue Twisters?. - Nueva York-US : The Reader's Digest Association, 1944. - páginas 30-31 : ilustraciones full color - Mensual - Vol. 45, no. 271(Nom. 1944) - The Reader's Digest ; no.271 . - The Reader's Digest Association. .
Can you Say These tongue Twisters?. - Nueva York-US : The Reader's Digest Association, 1944. - páginas 30-31 : ilustraciones full color - Mensual - Vol. 45, no. 271(Nom. 1944) - The Reader's Digest ; no.271 . - The Reader's Digest Association. .