APA

Seo T., Sakai Y. & Hirai S. (1992). Development of checking system of guiding road signs using digital road map data base. : Statens Väg- och Trafikinstitut.

Chicago

Seo Takuya, Sakai Youichi and Hirai Setsuo. 1992. Development of checking system of guiding road signs using digital road map data base. : Statens Väg- och Trafikinstitut.

Harvard

Seo T., Sakai Y. and Hirai S. (1992). Development of checking system of guiding road signs using digital road map data base. : Statens Väg- och Trafikinstitut.

MLA

Seo Takuya, Sakai Youichi and Hirai Setsuo. Development of checking system of guiding road signs using digital road map data base. : Statens Väg- och Trafikinstitut. 1992.