As you are most likely aware, “et al.” is used to save writing out multiple authors’ names in various types of referencing styles.
Exactly when and how it is used depends on the referencing style, but there are some issues associated with its use that, as a proofreader, you should keep an eye out for.
Launch the microlearning module below to learn more about using et al. and to test your knowledge using our interactive quiz.
Top Five et al. Rules
Here are the things you should always remember about et al.:
- It is always et al. (not et. al, etal, et. al. or any other variation).
- The use of et al. automatically means that the associated verbs, pronouns etc will need to agree with the plural (“Jackson et al. (2020) have studied the problem. They suggest that…”). MS Word will not point this out to you in a grammar check, so be careful!
- As a Latin term in common use, you do not need to italicize et al. unless a style guide requires that you do so. Notably, IEEE italicizes et al.
- Et al. should only be used when citing a source with three or more authors; exact rules will vary between style guides.
- Any changes associated with the four points above can be made directly to the text, no comment required (unless the customer has inexplicably italicized et al. throughout, in which case you might want to briefly explain why you have or have not made changes to their approach).
Using et. al in In-Text Citations
How many authors need to be involved before et al. comes into play? Most styles require it for three or more authors, but there can be variations.
The table below shows how many authors are needed for et al. to be required in citations written in various common referencing styles. Note that the styles may have additional rules for avoiding ambiguity, for example.