Google Book Search --Reigeluth (1999)

http://books.google.com/books?id=AbJc4Kg6XQoC&pg=PA425&dq=The+elaboration+theory:+guidance+to+scope+and+sequence+decisions&ei=SfAnR5KzBaOGpwL49f3rDA&sig=8ii7IwbNzjnf5egDp6eKPbQPiAQ

Reigeluth, C. (1999). The elaboration theory: Guidance for scope and sequence decisions. In C.M. Reigeluth (ed.), Instructional-design theories and models: A new paradigm of instructional theory, volume ii. (pp. 425-459). Hillsdale, N. Lawrence Erlbaum Associates.