Coba jelasin Lihat pula dari Penulisan horizontal dan vertikal dalam aksara Asia Timur dong

Nihongo Daihakubutsukan (), author: Jun'ichirō Kida (), publisher: Just System (, Jasuto Shisutemu)  (in Japanese), chapter 9, deals with the change from tategaki to yokogaki in modern Japanese.

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Obana, Yasuko. “Vertical or Horizontal? Reading Directions in Japanese,” Bulletin of the School of Oriental and African Studies, University of London 60, no. 1 (1997): 86-94 (available in the JSTOR online journal archive).

Nishiyama, Yutaka. 2010. The Mathematics of Direction in Writing. International Journal of Pure and Applied Mathematics, Vol.61, No.3, 347-356.