Mayer, M., & Cylke, F. K. (1979). African Braille Production: A Statistical Review and Evaluation of Countries and Costs.
Citazione stile Chigago Style (17a edizione)Mayer, Marc, e Frank Kurt Cylke. African Braille Production: A Statistical Review and Evaluation of Countries and Costs. 1979.
Citatione MLA (9a ed.)Mayer, Marc, e Frank Kurt Cylke. African Braille Production: A Statistical Review and Evaluation of Countries and Costs. 1979.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.