http://www.stoa.org/diotima/essays/seaford.shtml
https://books.google.com.au/books?id=3qhQuWPNUckC&pg=PA90&lpg=PA90&dq=Diotima,+mystery+religion&source=bl&ots=KyF4m0ZXsh&sig=alHwxYzhk0yCaYGMlh5yJPNYTVs&hl=en&sa=X&ved=2ahUKEwjE7_-kqr_dAhVQObwKHWMFAw0Q6AEwBnoECAQQAQ#v=onepage&q=Diotima%2C%20mystery%20religion&f=false
http://www.stoa.org/diotima/syllabi/skinlecs13.shtml
http://web.nmsu.edu/~philosophia/Debra%20Nails.PDF
http://www.columbia.edu/~eg48/protoc18.html
http://commonweb.unifr.ch/artsdean/pub/gestens/f/as/files/4610/26399_133233.pdf