Thangtong Gyalpo (Wyl. thang stong rgyal po) aka Tsöndrü Zangpo (Wyl. brtson 'grus bzang po) (1385-1509) was a famous Tibetan siddha who travelled extensively in China, Tibet and other eastern countries, built numerous temples and metal bridges and founded monasteries at Dergé and elsewhere.
- Cyrus Stearns, King of the Empty Plain: The Tibetan Iron-Bridge Builder Tangtong Gyalpo, Snow Lion, 2007
- Manfred Gerner, Chakzampa Thangtong Gyalpo - Architect, Philosopher and Iron Chain Bridge Builder, 2007 (available online here)
- Tashi Tsering, 'On the Dates of Thang stong rgyal po' in Ramon N. Prats ed. The Pandita and the Siddha: Tibetan Studies in Honour of E. Gene Smith, New Delhi: Amnye Machen, 2007