Several authors supporting the same idea

When you base your text on several different sources supporting the same view in your in-text citation, your sources can be in alphabetical or chronological order. The sources are separated by semicolon. All sources should have separate entries in the reference list.

In-text citation

… (Chmiel 2008; Cole 2008; Weinberg 2007).

… (Weinberg 2007; Chmiel 2008; Cole 2008).