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Salamah, Umi (2023) Pengaruh Kualitas Produk dan Sales Promotion Terhadap Keputusan Pembelian Herbalife di Sidoarjo. (The Influence of Product Quality and Sales Promotion on Herbalife Purchasing Decisions in Sidoarjo). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.