APA (7th ed.) Citation

He, Q. (1992). The effect of global warming on U.S. agriculture and its variability. [publisher not identified].

Chicago Style (17th ed.) Citation

He, Qifen. The Effect of Global Warming on U.S. Agriculture and Its Variability. [Place of publication not identified]: [publisher not identified], 1992.

MLA (9th ed.) Citation

He, Qifen. The Effect of Global Warming on U.S. Agriculture and Its Variability. [publisher not identified], 1992.