International Conference on Climbing and Walking Robots Portsmouth, U.K., & Virk, G. (1999). Proceedings of the 2nd International Conference on Climbing and Walking robots (CLAWAR 99), Flagship city of Portsmouth, Portland Building, University of Portsmouth, U.K.,13-15 September 1999. Professional Engineering Pub.
Chicago-referens (17:e uppl.)International Conference on Climbing and Walking Robots Portsmouth, U.K., och G.S Virk. Proceedings of the 2nd International Conference on Climbing and Walking Robots (CLAWAR 99), Flagship City of Portsmouth, Portland Building, University of Portsmouth, U.K.,13-15 September 1999. Bury St. Edmunds: Professional Engineering Pub, 1999.
MLA-referens (9:e uppl.)International Conference on Climbing and Walking Robots Portsmouth, U.K., och G.S Virk. Proceedings of the 2nd International Conference on Climbing and Walking Robots (CLAWAR 99), Flagship City of Portsmouth, Portland Building, University of Portsmouth, U.K.,13-15 September 1999. Professional Engineering Pub, 1999.