Dinchev, Dragomir (May 2007). "Distribution of steroidal saponins in Tribulus terrestris from different geographical regions". Phytochemistry. 69 (1): 176–186. doi:10.1016/j.phytochem.2007.07.003. PMID17719068.
Boydston, Rick A. (January 1990). "Time of Emergence and Seed Production of Longspine Sandbur ( Cenchrus longispinus ) and Puncturevine ( Tribulus terrestris )". Weed Science. 38 (1): 16–21. doi:10.1017/S0043174500056058. S2CID83398569.
"Caltrop (Tribulus terrestris)"(PDF). Natural Resources Management Act 2004, Government of Australia. 28 July 2014. Retrieved 13 September 2019.
rdosmaps.bc.ca
Lisa Scott (1 February 2008). "Puncturevine (Tribulus terrestris)"(PDF). Regional District Okanagan-Similkameen, Province of British Columbia. Retrieved 27 July 2019.
semanticscholar.org
api.semanticscholar.org
Boydston, Rick A. (January 1990). "Time of Emergence and Seed Production of Longspine Sandbur ( Cenchrus longispinus ) and Puncturevine ( Tribulus terrestris )". Weed Science. 38 (1): 16–21. doi:10.1017/S0043174500056058. S2CID83398569.
USDA, NRCS (n.d.). "Tribulus terrestris". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 3 February 2016.