Sometimes you may need to reference more than one source in a set of parentheses, as several sources may have made the same claim or had the same idea. If this is the case, enclose all the in-text references in the same set of parentheses in alphabetical order, and separate each set with a semicolon.
For example:
(Adams et al., 2019; Shumway & Shulman, 2015; Westinghouse, 2017)
