Jelaskan Rujuakan dari Ryō dalam bahasa minangkabau

Lucassen, Jan. Wages and Currency: Global Comparisons from Antiquity to the Twentieth Century. Peter Lang (2007),

Ohnuki, Mari, "The Genroku, Hoei, Shotoku, Kyoho, and Gembun Koban", Short Essays on Monetary History Contained in Monetary and Economic Studies, Research Division 3, Institute for Monetary and Economic Studies, Bank of Japan (ed.), Monetary and Economic Studies, 15.2 (1997).

Honjo, Eijiro, "The Economic thought in Tokugawa days", Kyoto University Economic Review, vol. xiii, no. 1 (Kyoto, Oct. 1938), p. 1–22. [Overview of the period 1600 to 1867]