The practice is as follows:

1, the text part contains:

....

From 2000 to 20 17 years, the change curve of sales volume is shown in the figure. [ 1]

.....

2. The last part of the reference and literature gives the correct information sources. such as

[1]XX Company Annual Report.

3. Give the original or photocopy of the material in the attachment of the paper, or give the electronic file of the material in the digital version of the paper.

Such as: copy of xx Company Annual Report. It should have the relevant seal of xx Company.

ps:

1, the so-called "authenticity" proof is to make the data and materials cited in the paper seem to have a source. Whether to provide the original or copy of the source is uncertain. In short, just give the place.

As for the verification of "authenticity", it is based on the sources you give, such as literature, such as experiments and so on. It is the reader's business to collect evidence on the spot. When an important paper is quoted or repeated, it is usually only the function of citation.

2. For the undergraduate stage, even the master's degree in China and even more advanced papers, many of them are "true in form", that is, they seem to be "well documented everywhere" and "verified by experiments everywhere". Unless your paper is excellent, who will really verify it item by item?