Example:
Cassell et al. (2018) state that...
OR
....(Cassell et al., 2018).
Last name, Initial(s)., & Last name, Initial(s). (Ed.). (Year). Title. (ed.). Publisher. DOI (if available)
Note: Use (Ed.) if one editor and (Eds.) if two or more editors.
Example
Cassell, C., Cunliffe, A. L., & Grandy, G. (Eds.). (2018). The SAGE handbook of qualitative business and management research methods. Sage. https://dx.doi.org/10.4135/9781526430212