Pengaruh persepsi mengenai social change campaign terhadap sikap (studi kasus gerakan nasional waspada obat dan makanan ilegal di Provinsi Riau) = The influence of perceptions of social change campaign to attitude case study on gerakan nasional waspada obat dan makanan ilegal in (Riau Province) / Merry Indrayani - Merry Indrayani, author (2014)