APA (7e ed.) Bronvermelding

(1989). Validating the Concrete to Abstract Instructional Sequence for Teaching Place Value to Learning Disabled Students. Monograph #20 Susan K. Peterson and Others. [microform].

Chicago (17e ed.) Bronvermelding

Validating the Concrete to Abstract Instructional Sequence for Teaching Place Value to Learning Disabled Students. Monograph #20 Susan K. Peterson and Others. [microform]. 1989.

MLA (9e ed.) Bronvermelding

Validating the Concrete to Abstract Instructional Sequence for Teaching Place Value to Learning Disabled Students. Monograph #20 Susan K. Peterson and Others. [microform]. 1989.