TY  - BOOK
AU  - Siele, John Arap
AU  - Hacker, Gerry
TI  - Teaching science at a distance
T2  - IEC Broadsheets on Distance Learning: 10
SN  - 0903632144
U1  - 507 
PY  - 1977///
CY  - England
PB  - International Extension College
KW  - Science - Study and teaching
ER  -