Association for Supervision and Curriculum Development. Committee on the Three R's in the Elementary School. (1952). The three R's in the elementary school. s. n.
Citazione stile Chigago Style (17a edizione)Association for Supervision and Curriculum Development. Committee on the Three R's in the Elementary School. The Three R's in the Elementary School. Washington: s. n, 1952.
Citatione MLA (9a ed.)Association for Supervision and Curriculum Development. Committee on the Three R's in the Elementary School. The Three R's in the Elementary School. s. n, 1952.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.