Communicator Sphere | Universitas Bhayangkara Surabaya. Cambridge University Press.
芝加哥风格引文Communicator Sphere | Universitas Bhayangkara Surabaya. Cambridge University Press.
MLA引文Communicator Sphere | Universitas Bhayangkara Surabaya. Cambridge University Press.
警告：这些引文格式不一定是100％准确.