Author. (year). Title of the article. Publication name, volume number (issue number) and page number.
For example:
The name of a scholar. (202 1). Supplement 1. Academic Journals, 1( 1), 23-35.
It should be noted that if you quote the whole supplement, you need to add the word "supplement" after the title of the article, as shown above. At the same time, if Chinese journal names are used, they need to be translated into English.
When the paper quotes the first issue of the supplement, it can be cited as an article or according to the above format. If you only quote the first supplement, you can use it as a reference to the article, according to the way of quoting the article.
In a word, for the citation of the first issue of the supplement, it is necessary to follow the corresponding paper citation norms to ensure the correctness and accuracy of the citation format.