APA引文

HUBBARD, R. G. (2017). Economics. Pearson Education.

芝加哥风格引文

HUBBARD, R. Glenn. Economics. Pearson Education, 2017.

MLA引文

HUBBARD, R. Glenn. Economics. Pearson Education, 2017.

警告：这些引文格式不一定是100％准确.