 | York Times. Ribbel, Arthur (September 15, 1985). "The lessons were tough for San Diego's first teacher". The San Diego Union. p. G-2. Ribbel, Arthur (December... 10 KB (976 words) - 04:50, 26 September 2023 |
"Rupert and Jeannette Costo Papers". UCR Library. Retrieved August 11, 2022. Ribbel, Arthur (September 28, 1966). "Publication Fights False Indian image". The... 8 KB (666 words) - 18:15, 19 February 2024 |
 | in every individual group. Ribbels: 6–8 years old (not in every Chiro group) Speelclub: 8–10 years old, if there are ribbels, else 6–9 years old Rakwi:... 9 KB (836 words) - 03:04, 4 December 2023 |