Hartlein, M. L. Construction and evaluation of a test to measure elementary mathematical understandings. Michigan University Microfilms.
Citazione stile Chigago Style (17a edizione)Hartlein, Marion Louise. Construction and Evaluation of a Test to Measure Elementary Mathematical Understandings. Ann Arbor: Michigan University Microfilms.
Citatione MLA (9a ed.)Hartlein, Marion Louise. Construction and Evaluation of a Test to Measure Elementary Mathematical Understandings. Michigan University Microfilms.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.