Give the first six authors, then ellipses (...) and then the last author. Remember to list the authors' names in the order in which they occur on the document!
Template:
Author, A. A., Author, B. B., Author, C. C., Author, D. D., Author, E. E., & Author, F. F., ... Author, Z. Z. (Year). ...
Example
Jones, R., Skitter, L, March, N., Potter, L., Crowley, D., Smith, F., ... Hilbert, B. (2012) ...