How to cite chapter from a report with different authors?

I have to cite a multi-chapter report. Every chapter has different authors, should I cite with the name of the main author and then the specific chapter? Or should I use the first author of the chapter I am citing?

If main author is Smith but Jess is the author of a chapter where Smith is not in the authors list, should I cite with (Smith et. al 2000, ch 6) or (Jeff et. al 2000) and then add a citation for each chapter in the cited literature section?