1840 (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "1840" in Portuguese language version.

Last modified: 13:29:40, 21 March 2026 (UTC)

Ref.Un. Ref.Website

Global rank Portuguese rank

11books.google.com

3^rd place

7^th place

books.google.com (Global: 3^rd place; Portuguese: 7^th place)

Stuart D. B. Picken (2009). The A to Z of Japanese Business. Rowman & Littlefield. p. 22. ISBN 978-0-8108-6872-4.