If you omit the brackets, and especially if you make the footnote reference a mere superscript (in smaller font), it becomes pretty difficult to manage to click on the link with a mouse.
(Latin for and others) after the first author’s name. How to format footnotes correctly: Always use the footnotes function. When there are four or more authors, add et al. The note number goes after all other punctuation. Footnotes for sources with two or three authors should include all the authors’ names.Within the essay text: put the note number at the end of the sentence where the reference occurs, even if the cited material is mentioned at the beginning of the sentence.
Footnotes go at the bottom of the page where the reference occurs endnotes go on a separate page after the body of the paper.