Dumas, E. (1971). Math activties for child involvement. Allyn and bacon.
Citazione stile Chigago Style (17a edizione)Dumas, Enoch. Math Activties for Child Involvement. Boston, Mass: Allyn and bacon, 1971.
Citatione MLA (9a ed.)Dumas, Enoch. Math Activties for Child Involvement. Allyn and bacon, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.