Từ điển

• http://www.alphadictionary.com/directory/Specialty_Dictionaries/Agriculture/

Bách khoa toàn thư                               

• Plant Encyclopedia
• http://www.wikipedia.org/wiki/                    
• http://www.encyclopedia.com/                    
• http://www.britannica.com                                                                                                  
•  http://www.bachkhoatoanthu.gov.vn