Epistola, N. V. (1967). Problem solving method: An approach to revitalize the teaching of social studies to academically superior children in the intermediate grades.
Citazione stile Chigago Style (17a edizione)Epistola, Nicetas V. Problem Solving Method: An Approach to Revitalize the Teaching of Social Studies to Academically Superior Children in the Intermediate Grades. 1967.
Citatione MLA (9a ed.)Epistola, Nicetas V. Problem Solving Method: An Approach to Revitalize the Teaching of Social Studies to Academically Superior Children in the Intermediate Grades. 1967.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.