(1)
Department of Economics, Faculty of Economics and Business, Universitas Gadjah Mada, Yogyakarta, Indonesia
,
(2)
Department of Economics, Faculty of Economics and Business, Universitas Gadjah Mada, Yogyakarta, Indonesia
,
(3)
Department of Economics, Faculty of Economics and Business, Universitas Gadjah Mada, Yogyakarta, Indonesia
,
(4)
Department of Economics, Faculty of Economics and Business, Universitas Riau, Pekanbaru, Indonesia