TY  - BOOK
AU  - Wagner,Leslie,1943-
TI  - The economics of educational media
SN  - 0333316908
PY  - 1982///
CY  - London
PB  - MacMillan
KW  - Audio
KW  - visual education
KW  - Economic aspects
N1  - Bibliography: p152-157. - Includes index
ER  -