ScienceDirect (Online service). Topology. Pergamon Press.
芝加哥风格引文ScienceDirect (Online service). Topology. Oxford ; New York: Pergamon Press.
MLA引文ScienceDirect (Online service). Topology. Pergamon Press.
警告:这些引文格式不一定是100%准确.
ScienceDirect (Online service). Topology. Pergamon Press.
芝加哥风格引文ScienceDirect (Online service). Topology. Oxford ; New York: Pergamon Press.
MLA引文ScienceDirect (Online service). Topology. Pergamon Press.