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sudirman, sudirman and Osrita, Hapsara and M.Zahari, MS (2020) Metode Penelitian Kuantitatif. Magnum, Yogyakarta. ISBN 978-602-5789-95-3
M.Zahari, MS and sudirman, sudirman (2017) Green Ekonomi. Tangga Ilmu, Yogyakarta. ISBN 978-602-98052-9-1