....................................Dịch cái kia xong chưa mấy bọn, chắc lè lưỡi òi chớ jì...................................Kakaka........................... Tiếp nè.....................................Kakaka.............................

http://en.wikipedia.org/wiki/Vascular_plant

http://hcs.osu.edu/hcs300/svp1.htm

http://www.ehow.com/list_5778872_characteristics-seedless-vascular-plants.html

http://facultyweb.wcjc.edu/biology/BIOL1407/Lab%20Handouts/Lab_4_land_plants_I.pdf