The plural form of citation is citations.
Do you refer to et al as plural?
"et al." is generally used for papers with more than two authors. (Note that "et al." makes the subject plural if the authors are the subject of the sentence rather than the paper, so it is "Smith et al. [1] show" not "shows".
How do you use citation in a sentence?
The in-text citation should occur in the sentence where the cited material has been used:
- Signal phrase reference (author's name) appears within the sentence with page number in parentheses at the end of the sentence.
- Full parenthetical reference (author last name and page number) appears at the end of the sentence.
