American Society of Agronomy, Crop Science Society of America, & Soil Science Society of America. (2016). Agricultural & environmental letters. American Society of Agronomy.
Chicago-referens (17:e uppl.)American Society of Agronomy, Crop Science Society of America, och Soil Science Society of America. Agricultural & Environmental Letters. Madison, WI: American Society of Agronomy, 2016.
MLA-referens (9:e uppl.)American Society of Agronomy, et al. Agricultural & Environmental Letters. American Society of Agronomy, 2016.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.