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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Conference on Climbing and Walking Robots Portsmouth, U.K., و 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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)International Conference on Climbing and Walking Robots Portsmouth, U.K., و 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.