Leonardo, A. (2016). Analisis Pengaruh Perceived Benefit, Free Mentality Dan Perceived Sacrifice Terhadap Attitude Toward Paying Dan Implikasinya Terhadap Willingness To Pay (Studi Pada Pengguna Joox VIP). Ultima Management : Jurnal Ilmu Manajemen, 8(2), 32-53. https://doi.org/https://doi.org/10.31937/manajemen.v8i2.591