APA引文

Nicholson-Lord D. David. (2006). Planet Earth. London, BBC Books, 2006.

Chicago Style (17th ed.) Citation

Nicholson-Lord D. David. Planet Earth. London, BBC Books, 2006, 2006.

MLA引文

Nicholson-Lord D. David. Planet Earth. London, BBC Books, 2006, 2006.

警告：這些引文格式不一定是100％准確.