@unpublished{repository9670,
           title = {Sertificate as Speaker on International Webinar FEB UHAMKA 2021.},
            note = {Unpublished},
       booktitle = {International Webinar The Potential of Green Innovation},
             url = {http://repository.uhamka.ac.id/id/eprint/9670/},
          author = {Nurhayadi, Yadi}
}