Metroo (Estonian Wikipedia)

Bolger, Paul (22.11.2004). "Site Name: Liverpool Overhead Railway & Dingle Station". Subterranea Britannica. Originaali arhiivikoopia seisuga 21.11.2012. Vaadatud 20.06.2021.

tfl.gov.uk (Global: 1,792^nd place; Estonian: 9,551^st place)

Transport for London (1981). London Underground: History. ISBN 978-0-904711-30-1. Originaali arhiivikoopia seisuga 16.01.2013. Vaadatud 20.06.2021. {{cite book}}: eiran tundmatut parameetrit |archive- url= (juhend)

thetransportpolitic.com (Global: low place; Estonian: low place)

"In response to growth, Chinese cities choose metros". The Transport Politic (Ameerika inglise). 17.01.2018. Originaali arhiivikoopia seisuga 07.09.2018. Vaadatud 20.06.2021.

uitfp.org (Global: low place; Estonian: low place)

ftp.uitfp.org

UITP (2011). "Recommended basic reference for developing a minimum set of standards for voluntary use in the field of urban rail, according to mandate M/486" (PDF). Originaali (PDF) arhiivikoopia seisuga 22.02.2014. Vaadatud 20.06.2021.

web.archive.org (Global: 1^st place; Estonian: 1^st place)

UITP (2011). "Recommended basic reference for developing a minimum set of standards for voluntary use in the field of urban rail, according to mandate M/486" (PDF). Originaali (PDF) arhiivikoopia seisuga 22.02.2014. Vaadatud 20.06.2021.
"Glossary of Transit Terminology" (PDF). American Public Transportation Association. Originaali arhiivikoopia (PDF) seisuga 12.05.2013. Vaadatud 20.06.2021.
Transport for London (1981). London Underground: History. ISBN 978-0-904711-30-1. Originaali arhiivikoopia seisuga 16.01.2013. Vaadatud 20.06.2021. {{cite book}}: eiran tundmatut parameetrit |archive- url= (juhend)
"China's Metro Boom Continues to Drive Rapid Transit Growth - Institute for Transportation and Development Policy". Institute for Transportation and Development Policy (Ameerika inglise). 30.07.2018. Originaali arhiivikoopia seisuga 20.11.2018. Vaadatud 20.06.2021.
"Metro Data". metro-data.info. Originaali arhiivikoopia seisuga 29.09.2018. Vaadatud 20.06.2021.
"Rapid Transit Trends Show Record Growth in 2016, with Huge Increases in China, Brazil - Institute for Transportation and Development Policy". Institute for Transportation and Development Policy (Ameerika inglise). 17.02.2017. Originaali arhiivikoopia seisuga 23.10.2013. Vaadatud 20.06.2021.
Smith, Stephen J. (06.01.2014). "New Starts: Shanghai Metro World's Longest, Panama Canal Drama, Japan's Maglev". Next City. Originaali arhiivikoopia seisuga 25.09.2014. Vaadatud 20.06.2021.
"Rapid Transit Trends Show Record Growth in 2016, with Huge Increases in China, Brazil - Institute for Transportation and Development Policy". Institute for Transportation and Development Policy (Ameerika inglise). 17.02.2017. Originaali arhiivikoopia seisuga 05.08.2021. Vaadatud 20.06.2021.
"In response to growth, Chinese cities choose metros". The Transport Politic (Ameerika inglise). 17.01.2018. Originaali arhiivikoopia seisuga 07.09.2018. Vaadatud 20.06.2021.

webcitation.org (Global: 25^th place; Estonian: 135^th place)

"Rapid transit". Merriam-Webster. Originaali arhiivikoopia seisuga 27.06.2013. Vaadatud 20.06.2021.
"Shanghai now the world's longest metro". Railway Gazette International. 4. mai 2010. Originaali arhiivikoopia seisuga 19. mai 2011. Vaadatud 20.06.2021.
Bolger, Paul (22.11.2004). "Site Name: Liverpool Overhead Railway & Dingle Station". Subterranea Britannica. Originaali arhiivikoopia seisuga 21.11.2012. Vaadatud 20.06.2021.

Metroo (Estonian Wikipedia)

apta.com (Global: 9,910th place; Estonian: low place)

itdp.org (Global: low place; Estonian: 9,569th place)

merriam-webster.com (Global: 425th place; Estonian: 419th place)

metro-data.info (Global: low place; Estonian: low place)

nextcity.org (Global: low place; Estonian: low place)

railwaygazette.com (Global: 1,769th place; Estonian: 5,920th place)

subbrit.org.uk (Global: low place; Estonian: low place)

tfl.gov.uk (Global: 1,792nd place; Estonian: 9,551st place)

thetransportpolitic.com (Global: low place; Estonian: low place)

uitfp.org (Global: low place; Estonian: low place)

ftp.uitfp.org

web.archive.org (Global: 1st place; Estonian: 1st place)

webcitation.org (Global: 25th place; Estonian: 135th place)

apta.com (Global: 9,910^th place; Estonian: low place)

itdp.org (Global: low place; Estonian: 9,569^th place)

merriam-webster.com (Global: 425^th place; Estonian: 419^th place)

railwaygazette.com (Global: 1,769^th place; Estonian: 5,920^th place)

tfl.gov.uk (Global: 1,792^nd place; Estonian: 9,551^st place)

web.archive.org (Global: 1^st place; Estonian: 1^st place)

webcitation.org (Global: 25^th place; Estonian: 135^th place)