Premium, Select, and Institutional Plus Member Book
(Jan 2003)
by Robert J. Marzano
Abelson, R. P. (1985). A variance explained paradox: When a little is a lot. Psychological Bulletin, 97, 166–169.
Ackerman, P. L. (1996). A theory of adult intellectual development: Process, personality, interests, and knowledge. Intelligence, 22, 227–257.