Several authors with the same surname

When you cite two authors with the same surname, they are distinguished by the year of publication in the in-text citation.

In-text citation

Johansson (2019) and Johansson (2017) both reported that…

Reference list

 Johansson, A. (2019). Title of the book. Place of publication: Publisher.

Johansson, R. (2017). Title of the book. Place of publication: Publisher.