Husodo, Sapto, and Bharoto Bharoto. 2009. “WILLINGNESS TO PAY KONSUMEN TERHADAP PRODUK PERTANIAN ORGANIK (STUDI KASUS DI KODYA YOGYAKARTA) (THE CONSUMER’S WLLINGNESS TO PAY FOR ORGANIC PRODUCT)”. Jurnal Ilmu-Ilmu Pertanian 5 (1):31-37. https://jiip.polbangtanyoma.ac.id/index.php/jiip/article/view/206.