Faktor-faktor penyebab rendahnya angka melenjutkan sekolah pada jenjang sekolah menengah pertama: Studi kasus di Kec.Cikedung dan Kec.Sukra,Kab.Indramayu = Uncontinued causal factors of elementary school children on their education to junior high school (case study in Sukra Distric and Cikedung Distric, Indramayu)