Programmed learning aid for business communications
| Egile nagusia: | |
|---|---|
| Beste egile batzuk: | |
| Formatua: | Liburua |
| Hizkuntza: | English |
| Argitaratua: |
Homewood, Ill.
Learning Systems Co.
c1976.
|
| Saila: | Irwin programmed learning aid series
|
| Gaiak: |