According to the APA 6th and 7th ed., to cite a source with more than six authors, include only the name of the first author followed by et al.
Hyatt et al. (2020)
(Hyatt et al., 2020)
To reference a source with more that six authors, list all the authors. Insert an ampersand (&) before the name of the last author.
Hyatt, J., Ross, A., Rowley, J., Abbott, A., Anand, A., & Saunders, M. (2020).