University of Leicester. The Journal of Transport History. Manchester, United Kingdom: University of Leicester; 1987. p. 41."Arxivlənmiş surət". Archived from the original on 2016-05-07. İstifadə tarixi: 2018-10-07.
University of Leicester. The Journal of Transport History. Manchester, United Kingdom: University of Leicester; 1987. p. 41."Arxivlənmiş surət". Archived from the original on 2016-05-07. İstifadə tarixi: 2018-10-07.