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We are providing the following links as a courtesy.
The University of Alabama at Birmingham School of Education
https://www.uab.edu/education/home/
The University of Alabama at Birmingham
Books by Jean Piaget
https://piaget.org/publications/
Free books by Piaget available on the Internet
Wiley Online Library - Measurement of Length: The Need for a Better Approach to Teaching
Measurement of Length: The Need for a Better Approach to Teaching
Wiley Online Library - The Measurement of Volume: Why Do Young Children Measure Inaccurately?
The Measurement of Volume: Why Do Young Children Measure Inaccurately?
Wiley Online Library - The Measurement of Time: Children's Construction of Transitivity, Unit Iteration, and Conservation of Speed