@article{1testing,
  title={Title 1},
  author={Zanthony1, Anthony2 and Anthony3},
  journal={Journal 1},
  volume={24},
  number={2},
  pages={258--300},
  year={1992},
  publisher={Springer}
}

@article{2testing,
  title={Title 2},
  author={Zanthony1, Anthony2 and Anthony3},
  journal={Journal 2},
  volume={24},
  number={2},
  pages={200--264},
  year={1992},
  publisher={Springer}
}

usepackage[backend=biber, style=authoryear, citestyle=authoryear]{biblatex}
    cite{1testing}
    cite{2testing}