Hi there! A website that i highly recommend is Perseus Digital Library. There you can find a ton of sources such as roman and greek historians, philosophers and much more. And, for our joy, you have them in Latin or Greek and a translation in English. Perseus provides two dictionaries too if you are reading or must consult a word in Latin or in Greek, it gives the etymology of the word as well its meaning using ancient sources as examples. It is really a good site. When i was researching Rome Civil War (69 A.D) and the Batavian Revolt i had to read Tacitus and i found my source both in Latin and in English there :) Here is the link for Perseus Digital Library: perseus.tufts.edu/hooper/