TY  - BOOK
AU  - Heinich, Robert.
AU  - Title.
TI  - INSTRUCTIONAL media and technologies for learning
SN  - 0138591598
PY  - 1999///
CY  - Upper Saddle River, N.J.
PB  - Merrill
KW  - Audio-visual education
KW  - Educational technology
N1  - Includes bibliographical references and index
ER  -