TY  - BOOK
AU  - Ledford,Bruce R.
AU  - Sleeman,Phillip J.
TI  - Instructional design: a primer 
SN  - 1930608004
AV  - LB1028.38  .L42 2000
PY  - 2000///
CY  - Greenwich, CT
PB  - Information Age Publishing
KW  - Instructional systems
KW  - Design
ER  -