Kepastian Hukum dalam Penyelesaian Sengketa Konsumen di BPSK (Studi Perbandingan Penyelesaian Sengketa Konsumen melalui Sengketa Alternatif di Indonesia dan Amerika Serikat) = Legal Certainty in the Settlement of Consumer Disputes in the BPSK (A Comparative Study of Consumer Dispute Resolution through Alternative Disputes in Indonesia and the United States)