Helmberg, G. (2007). Getting acquainted with fractals. Walter de Gruyter.
芝加哥风格引文Helmberg, Gilbert. Getting Acquainted with Fractals. Berlin ; New York: Walter de Gruyter, 2007.
MLA引文Helmberg, Gilbert. Getting Acquainted with Fractals. Walter de Gruyter, 2007.
警告：这些引文格式不一定是100％准确.