Kumpulan Daftar Isi Buku 614.4 GOR e (RS) Epidemiology : From association to causation : deriving inferences from epidemiologic studies, ( Ket. lihat Bab. 14 ) ( halaman 227-246 ) Gordis, Leon Philadelphia: Saunders Elsevier, 2009 https://lib.fkm.ui.ac.id:443/detail?id=104502