Anyone have favorite recommendations to learn about Greek (Roman, Egyptian too, but definitely closer to antiquity than medieval and later) mystery cults?

I have Hugh Bowden's Thames & Hudson text and Michael Cosmopoulos' work on the archaeology in my own collection. Should I next try Burkert's dedicated work on the mysteries? Anything else? Journal articles? Scholar specialists?

#GreekMythology #GreekReligion #polytheism #Classics #antiquity #Eleusinian #Orphic #Dionysian #Bacchic