rapid transit systems(英语:List of rapid transit systems) 地鐵列表 Kolkata metro expands. Railway Gazette. 10 September 2009 [28 July 2011]. (原始内容存档于2012-03-14)
[2023-06-13]. ISBN 978-3-030-78350-1. (原始内容存档于2022-09-28). Trains from Howrah Station Indian railway fan club(页面存档备份,存于互联网档案馆) Kolkata(Calcutta) Portal