TY  - BOOK
AU  - Reigeluth Charles M Ed.
AU  -  Beatty Brian J Ed. Myers Rodney D Ed.
TI  - Instructional- design theories and models: The learner- centered paradigm of education. V. 4
SN  - 978-1-138-01293-6
PY  - 2017///
CY  - London, UK
PB  - Routledge 
ER  -