The Training of adult middle-level personnel /
Gretler, Armin.
The Training of adult middle-level personnel / Armin Gretler. - Paris : UNESCO, 1972. - 164 p.
377: 374.7 (100) =20 GRE.
The Training of adult middle-level personnel / Armin Gretler. - Paris : UNESCO, 1972. - 164 p.
377: 374.7 (100) =20 GRE.