APA引文

Helmers, F. L. C. H. (1979). Project planning and income distribution. M. Nijhoff Pub..

芝加哥风格引文

Helmers, F. L. C. H. Project Planning and Income Distribution. Boston: M. Nijhoff Pub., 1979.

MLA引文

Helmers, F. L. C. H. Project Planning and Income Distribution. M. Nijhoff Pub., 1979.

警告：这些引文格式不一定是100％准确.