Martin, A. J. Motivation and engagement across the academic life span: A developmental construct validity study of elementary school, high school, and university/college students.

Martin, Andrew J. Motivation and Engagement Across the Academic Life Span: A Developmental Construct Validity Study of Elementary School, High School, and University/college Students.

Martin, Andrew J. Motivation and Engagement Across the Academic Life Span: A Developmental Construct Validity Study of Elementary School, High School, and University/college Students.