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Himawan, Okky (2021) Pelayanan Program Masyarakat Dalam Pencegahan Difteri (Studi Kasus Pada Program Imunisasi di Kecamatan Bulak Kota Surabaya). (Community Service Program in Diphtheria Prevention (Case Study on the Immunization Program in Bulak District, Surabaya City)). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.