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THE FOLLOWING TITLES represent only a fraction of the sources I consulted when researching Moonlight Over Paris, but if you are interested in learning more about the era, the people who lived through it, and the places that appear in my book, these books and articles are a good place to start. Most should be easily available through your local library or bookseller, though some are now out of print.
To begin, there is no better place to start than with John Baxter’s guides and histories to Paris. Few people know the City of Lights better than he, and if you can’t travel to Paris you can at least see the city through his eyes in The Most Beautiful Walk in the World: A Pedestrian in Paris and The Golden Moments of Paris: A Guide to the Paris of the 1920s. For a more general understanding of French life and culture in the interwar period, I recommend Paris 1919-1939: Art, Life, and Culture by Gérard Durozoi. For a history of art and artists in these years, Cubism and Twentieth-Century Art by Robert Rosenblum is an excellent resource.
The memoirs of the Lost Generation, though often unreliable in regard to details of their relationships and work, nonetheless contain a wealth of illuminating information on their day-to-day lives. Best known, of course, is A Moveable Feast by Ernest Hemingway, but I also recommend The Autobiography of Alice B. Toklas (which was actually written by Gertrude Stein), Shakespeare and Company by Sylvia Beach, Paris Was Yesterday by Janet Flanner, That Summer in Paris by Morley Callaghan, and Memoirs of Montparnasse by John Glassco.
For biographies of key Lost Generation figures, I recommend Hemingway: The Paris Years by Michael Reynolds, Paris Without End: The True Story of Hemingway’s First Wife by Gioia Diliberto, F. Scott Fitzgerald: The Paris Years by Paul Brody, Zelda: An Illustrated Life by Eleanor Lanahan, Gertrude and Alice by Diana Souhami, and Sylvia Beach and the Lost Generation: A History of Literary Paris in the Twenties and Thirties by Noel Riley Fitch.
To learn more about the salons of Gertrude Stein and Natalie Barney, search out “The Stein Salon was the First Museum of Modern Art” by James R. Mellow (New York Times, 1 December 1968) and Wild Heart: Natalie Clifford Barney and the Decadence of Literary Paris by Suzanna Rodriguez.
For more information on Sara and Gerald Murphy, I recommend Everybody Was So Young: Gerald and Sara Murphy—A Lost Generation Love Story by Amanda Vaill, “Living Well is the Best Revenge” by Calvin Tomkins (New Yorker, 28 July 1962), and Sara and Gerald: Villa America and After by Honoria Murphy Donnelly and Richard N. Billings.
The memoirs of the men who worked at the Paris edition of the Chicago Tribune make for especially entertaining reading. The best of these are The Start by William L. Shirer, The Last Time I Saw Paris by Elliott Paul, and The Paris Edition: The Autobiography of Waverley Root, 1927-1934. News of Paris: American Journalists in the City of Light Between the Wars by Ronald Weber is an excellent resource as well.
Last of all, if you would like to read more fiction set in this period, I recommend Villa America by Liza Klaussmann, The Beautiful American by Jeanne Mackin, The Paris Wife by Paula McLain, Call Me Zelda by Erika Robuck, and The Other Daughter by Lauren Willig. 
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