如题,本人新手,不太明白,还请指点。例子如下:
1.Robert Goodland and Jeff Anhang,2009,Livestockand Climate Change,World Watch,11.
2.Grossman G. M. and Krueger A. B,1991,EnvironmentalImpacts of a North American Free Trade Agreement,NBERWorking Papers ,No.3914.
3.FAO,2006,LivestockLong Shadow.