Türkiye
Operation of the single window
Ministry of Trade
Communiques, regulations and general application of Single Window System
https://ticaret.gov.tr/gumruk-islemleri/dijital-gumruk-uygulamalari/tek-pencere-sistemi
(Single Window)
https://ticaret.gov.tr/gumruk-islemleri/dijital-gumruk-uygulamalari/liman-tek-pencere-sistemi
(Port Single Window)