APA引文

Croner, U. H. E. (1964). Trade directories of the world.

Chicago Edition Citation

Croner, Ulrich H. E. Trade Directories of the World. 1964.

MLA引文

Croner, Ulrich H. E. Trade Directories of the World. 1964.

警告：这些引文格式不一定是100％准确.