1. Doctoral Program in Islamic Economy and Halal Industry, Universitas Gadjah Mada Graduate School, Yogyakarta, Indonesia; Department of Food Service Industry, Faculty of Economics and Business, Universitas Ahmad Dahlan, Yogyakarta, Indonesia.
2. Department of Animal Products Technology, Faculty of Animal Science, Universitas Gadjah Mada, Yogyakarta, Indonesia; Department of Halal Science, Institute of Halal Industry and System, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia.
3. Department of Management, Faculty of Economics and Business, Universitas Gadjah Mada, Yogyakarta, Indonesia.