Problem finding sources

I have been assigned to write an essay comparing and contrasting the character of Hippolytus from Jean Racine's play Phaedra and the character of Hippolytus from Euripides' play Hippolytus.  My sources need to come from credible places like Ebscohost, however I am having problems finding sources at all.  Also, I really don't even understand the differences bewteen the two characters.  Can you please help me find good sources and to understand the characters?