(1)
Doctoral Program in Islamic Economy and Halal Industry, Graduate School, Universitas Gadjah Mada, Yogyakarta, Indonesia and Department of Mathematics, Faculty of Mathematics and Natural Sciences, University of Mataram, Mataram, Indonesia
,
(2)
Department of Economics, Faculty of Economics and Business, Universitas Gadjah Mada, Yogyakarta, Indonesia
,
(3)
Department of Management, Faculty of Economics and Business, Universitas Gadjah Mada, Yogyakarta, Indonesia
,
(4)
Department of Social Development and Welfare, Faculty of Social and Political Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia