Aktivitas insektisida ekstrak kulit batang empat famili tumbuhan terhadap ulat krop kubis Crocidolomia pavonana (F.): Insecticidal activity of bark extracts of four plant families against cabbage head caterpillar Crocido - Perpustakaan UGM, i-lib ([Yogyakarta] : Universitas Gadjah Mada, 2004)