Since Traveller was created in the 1970s I think SF from the fifties and sixties capture the mood better than most recent novels.
James Schmitz, particularly his "hub" stories like Demon Breed or his short stories. His Witches of Kares and Telzey Amberdon stories I think helped inspire the Traveller psi rules.
Alexei Panshin's "Anthony Villiers" novels (Star Well, The Thurb Revolution, and Masque World, available in digital format) give an excellent view of the life of a young noble in the Nashuin interstellar empire. IIRC, Anthony Villiers was in one of the CT supplements (1001 Patrons?)
James Schmitz, particularly his "hub" stories like Demon Breed or his short stories. His Witches of Kares and Telzey Amberdon stories I think helped inspire the Traveller psi rules.
Alexei Panshin's "Anthony Villiers" novels (Star Well, The Thurb Revolution, and Masque World, available in digital format) give an excellent view of the life of a young noble in the Nashuin interstellar empire. IIRC, Anthony Villiers was in one of the CT supplements (1001 Patrons?)