File talk:2020CD3.jpg

Source specification

Tony873004 , could you please provide a precise source?
-If you picked the file from the internet - please provide a specific URL.
-If you digitized it yourself, then please state so and therefore please specify the book you took as source, e.g. giving the ISBN number. If possible add pagenumber.
-If you made a diagram yourself - please provide your Template or data-source
-If there is a sourcecode used in generation, it is highly appreciated to provide it.
Thanks in advance. --Itu (留言) 09:08, 1 March 2020 (UTC)