APA

Ontario. Institute for Studies in Education. Educational Research se ries, . (1967). Recent research on the acquisition of conservation of substance. Rep ort of papers from a seminar held in connection with the Conference on Preschool Education, Ontorio Institute of Education, November 15-17, 19 66. Toronto: Ontorio Institute for Studies in Education.

Chicago

Ontario. Institute for Studies in Education. Educational Research se ries, . 1967. Recent research on the acquisition of conservation of substance. Rep ort of papers from a seminar held in connection with the Conference on Preschool Education, Ontorio Institute of Education, November 15-17, 19 66. Toronto: Ontorio Institute for Studies in Education.

Harvard

Ontario. Institute for Studies in Education. Educational Research se ries, . (1967). Recent research on the acquisition of conservation of substance. Rep ort of papers from a seminar held in connection with the Conference on Preschool Education, Ontorio Institute of Education, November 15-17, 19 66. Toronto: Ontorio Institute for Studies in Education.

MLA

Ontario. Institute for Studies in Education. Educational Research se ries, . Recent research on the acquisition of conservation of substance. Rep ort of papers from a seminar held in connection with the Conference on Preschool Education, Ontorio Institute of Education, November 15-17, 19 66. Toronto: Ontorio Institute for Studies in Education. 1967.