Principles of Instructional Design Fourth Edition
By Robert M. Gagne, Leslie J. Briggs, and Walter W. Wager
Published by Harcourt Brace Jovanovich College Publishers ISBN 0-03-034757-2
Copyright 1992

Instructional Design
By Patricia L. Smith and Tillman J. Ragan
Published by Macmillan Publishing Company ISBN 0-675-21262-6
Copyright 1993

Mastery Learning Theory and Practice
Edited by James H. Block
Published by Holt, Rinehart and Winston, Inc. SBN 03-086073-3
Copyright 1971

Taxonomy of Educational Objectives Book 1 Cognitive Domain
Edited by Benjamin S Bloom
Published by Longman ISBN 0-582-28010-9
Copyright 1956 Copyright renewed 1984