na INLIS000000000002573 I 0010-0317002571 Dasar-dasar penyuluhan pertanian Sugiyanto Malang : Fak. Pertanian - Univ. Brawijaya 2001 iv, 191 hlm. 21 cm 9795082078 630.715 Sug d 630.715 AGRICULTURAL EXTENSION WORK 005405111