Effectiveness of public service program related cocoa fermentation sop in increasing the knowledge of cocoa farmer oleh Hanif Alamudin Mansur, Noor Harini, Elfi Anis Saati, D. Damat, W. Warkoyo, S. Sukardi, Vritta Amroini Wahyudi, Rista Anggriani, Devi Dwi Siskawardani, Afifah Husna, Desiana Nuriza Putri, Nafidzah Nur, Ayu Lestari