Xinhua News Agency. (2017). US researchers invent first battery-free cellphone. Manila Bulletin.
Citazione stile Chigago Style (17a edizione)Xinhua News Agency. "US Researchers Invent First Battery-free Cellphone." Manila Bulletin 2017.
Citatione MLA (9a ed.)Xinhua News Agency. "US Researchers Invent First Battery-free Cellphone." Manila Bulletin, 2017.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.