Flexner, Eleanor, American Playwrights: 1918 1938, Simon & Schuster, 1938, pp. 216-20.

This book considers the careers of the most important playwrights on the American stage, including Hart and Kaufman. Flexner considers and compares Once in a Lifetime and other plays.

Hart, Moss,Acf One: An Autobiography, RandomHouse, 1959.

This memoir covers the whole of Hart's professional life, including details surrounding the conception and production of Once in a Lifetime.

Pollack, Rhoda-Gale, George S. Kaufman, Twayne Publishers, 1988.

This critical biography on Kaufman's professional life includes a chapter on his collaborations with Hart.

Teichmann, Howard, George S. Kaufman: An Intimate Portrait, Atheneum, 1972.

This biography includes Kaufman's personal and professional life, including his work on and in Once in a Lifetime.