山羊百科，林文智老師的植物、山岳、攝影紀錄

Part I

• e-Flora of Thailand；37. Geophila D.Don；https://botany.dnp.go.th/eflora/floraGenus.html?factsheet=Geophila&tdcode=07942

Part II

Part III

1. Teo, S., B. R. Kurukulasuriya and H. T. W. Tan 2010 The distribution and status in Singapore of the snake pennywort, Geophila repens (L.) I.M.Johnst. (Rubiaceae) NATURE IN SINGAPORE 3: 183–186