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営業線の概要 [Overview of operating lines] (in Japanese). 大阪市営交通局 [Osaka Municipal Transportation Bureau]. Archived from the original on January 11, 2014. Retrieved June 7, 2014.
"交通局の予算・決算について" [For budget and balance sheet of Transportation Bureau] (in Japanese). 大阪市営交通局 [Osaka Municipal Transportation Bureau]. Archived from the original on December 18, 2014. Retrieved December 18, 2014.
大阪府内で働く人の通勤時間は「52分」――理想の路線は？. bizmakoto.jp (in Japanese). September 9, 2014. Archived from the original on September 7, 2014. Retrieved September 8, 2014.
Subway 2018, p. 44. "長堀鶴見緑地線の歴史を辿る"(PDF). SUBWAY (in Japanese). Vol. 8, no. 218. Japan: Japan Subway Association. 31 August 2018. pp. 42–45. ISSN0289-5668. Retrieved 31 January 2024.
