?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Andi&rft.aulast=Thahir&rft.au=Thahir%2C+Andi&rft.title=Optimism+in+the+Youth+Mental+Health+Online+Counselling+Environment&rft.degree=Diploma&rft.date=25+March+2020&rft.inst=Poltekkes+Tanjungkarang