Photograph of Elephant-Mounted Double-bow Arcuballista manned by Archers with Distinctive Cham (feuderal kingdom in the area of Southern Vietnam) Headgear, Shirt and Facial Features, and a Wheel-Mounted Double-bow Arcuballista (Photograph courtesy of Dr. Thanakvaro T. De Lopez of the Cambodian Research Centre for Development (CRCD))

"Chinese Siege Warfare: Mechanical Artillery & Siege Weapons of Antiquity" by Liang Jieming, ISBN 981-05-5380-3

http://authors.history-forum.com/liang_jieming/chinesesiegewarfare/images/ref-chamballista.jpg

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The photographs are part of my book. You're welcome to use them on Wikipedia so long as you list my book "Chinese Siege Warfare: Mechanical Artillery & Siege Weapons of Antiquity" by Liang Jieming (ISBN 981-05-5380-3) as the source.

I hope that helps.

Cheers, Leong Kit Meng (Liang Jieming) <liang_jieming@history-forum.com>