APA引文

Brualdi, R. A. Introductory Combinatorics (4th.).

芝加哥风格引文

Brualdi, Richard A. Introductory Combinatorics. 4th.

MLA引文

Brualdi, Richard A. Introductory Combinatorics. 4th.

警告：这些引文格式不一定是100％准确.