Footnote format is used to indicate the source, provide references, etc. There are mainly the following types:

1. Books: author's name, work name, edition, publishing house name, publishing place and date, in the format of [author's name, work name, edition, publishing house name, publishing place and date].

2. Periodical: author's name, article name, periodical name, place of publication, date of publication, volume number, issue number and page number, in the format of [author's name, article name, periodical name, place of publication, date of publication, volume number, issue number and page number].

3. Other types: author's name, work name, publishing house name, publishing place and date. Format: [name of author, name of work, name of publishing house, place and date of publication].

In addition, for online literature, it is also necessary to indicate the website address in the footnote and mark "[see Internet]". Format: [author's name, work name, website, [see Internet]].