Below you will find guidance and examples of how to set out a reference to a book with three or more authors in the body of your work and in the reference list at the end.
If there are three or more authors of a work only the first author should be cited followed by et al. and the date
According to McDuff et al. (2017)....
...(McDuff et al., 2017).
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Last name, Initial(s)., & Last name, initial(s). (Year). Title (ed.). Publisher.
McDuff, C., Smith, J., Kensington, K., Jones, S., Coughlan, S., Bortolin, L., Witte, M., Scott, A., Newport, A., Jensen, K., Wutzler, J., van Staden, I., McLean, J., Bergsma, G., Dowman, B., Petrie, K., Higgens, D., McCloud, R., Jessop, L. & Duncan, P. (2017). An introduction to quantitative analysis in finance. Houghton.
NB: In the reference list include all authors, however if a reference has 21 or more authors, the first 19 authors are listed followed by ... followed by the final author.