You should consult the BFQ with original copyright in 1993, Organizzazioni Speciali, Florence Italy (most likely with adaptation, editing and new copyright in the country in which you reside). Here you can find the data (for use and application) and the studies on which it is based.
For a work that I had to do I followed the bibliography indicated in this test as well as part of the history of the factors (in capital letters as they appear in BFQ):
ENERGY: Extraversion (Costa and McCrae). Surgency of the Goldberg model (quantity and intensity of interpersonal interactions, in relation to affection, assertiveness, activity and gregarism).
AFFAIRS: Liking (Costa and McCrae). Similar to cordiality vs. hostility (Digman)
MENTAL OPENING: Opening the experience (Costa and McCrae).
No matter what time you have, you will not be able to see the whole story of all the factors, you should close the focus on those that seem more interesting for your study.