List works by different authors in alphabetical order by last name of the first author (the same order as in the reference list) and use semicolons to separate the references. Note that these will not necessarily be in order by date.

Example: (Blau, 2017b; Kafai, & Resnick, 1996; O’Meara et al., 2014)

However, if you are citing two that shorten to the same “et al.” list them in order of the date of publication, which may not be in the same order as in the reference list.

Example: Several studies (O’Meara et al., 2014, 2018) …