APA引文

(1987). 1987: The state of the world environment. UNEP.

Chicago Style (17th ed.) Citation

1987: The State of the World Environment. Nairobi: UNEP, 1987.

MLA引文

1987: The State of the World Environment. UNEP, 1987.

警告：這些引文格式不一定是100％准確.