ENCYCLOPEDIA BRITANICA. (2004). FOOD PLANTS LEARN ABOUT THE MANY DIFFERENT KINDS OF PLANTS WE EAT. ENCYCLOPEDIA BRITANICA.
Chicago-referens (17:e uppl.)ENCYCLOPEDIA BRITANICA. FOOD PLANTS LEARN ABOUT THE MANY DIFFERENT KINDS OF PLANTS WE EAT. CHICAGO: ENCYCLOPEDIA BRITANICA, 2004.
MLA-referens (9:e uppl.)ENCYCLOPEDIA BRITANICA. FOOD PLANTS LEARN ABOUT THE MANY DIFFERENT KINDS OF PLANTS WE EAT. ENCYCLOPEDIA BRITANICA, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.