This depends on the purpose of the picture and the specialty of the article. For example, in urban planning articles, aerial views do not need a source, nor do self-drawn construction drawings, etc., but quoted pictures need to have clear sources. Insert a line of small text below the picture, for example, it is taken from so-and-so. For example, picture source: China Internet Network Information Center.
The image format requires IIF or JPG format. The width of the half bar graph is less than 3.5cm, and the width of the ordinary bar graph is less than 11cm. Use small five blacks in chart order and titles, and leave a space between them. Usually in the blank space of the picture.
Reference format
[Serial number] Journal author. Title［J]． Journal title. Year of publication, volume (issue): starting and ending page numbers.
[Serial number] Author of the monograph. Book title [M]. Edition (the first edition can be omitted). Place of publication: publishing house, year of publication: starting and ending page numbers.
[Serial number] Author of the collection of papers. Title〔C〕. editor. Title of thesis collection. Place of publication: publishing house, year of publication: starting and ending page numbers.
[Serial number] Dissertation author. Title〔D〕. Storage location: storage unit, year.
[Serial Number] Patent owner. Patent document title〔P〕． Country: Patent number. release date.
[Serial number] Standard number, standard name [S]. Place of publication: Publisher, year of publication.
[Serial number] Newspaper author. Title〔N〕． Newspaper name, publication date (edition).
[Serial Number] Report author. Title〔R〕． Reporting place: Organizer of the report meeting, year.
[Serial number] Author of electronic documents. Title [Electronic document and carrier type identification]. Document source, date.