For those like rules about such things, here are some rules from Margaret Atherton (Milwaukee), in this summary of her 2017 Dewey Lecture at the Central APA.
And here are even more rules, which Peter Adamson (Munich) posted a few months ago.
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I hope I may be so bold as to engage in some self-promotion. For those who are interested in this kind of thing, as well as broader methodological issues for the history of philosophy: We are organising a summer school on methodology in Groningen this summer (26-29 June). More information on the website: http://www.rug.nl/education/summer-winter-schools/summer_schools_2017/understanding_the_past_today/