John Belton, who teaches at Rutgers University, devoted one-third of his first book, The Hollywood Professionals, Volume 3 (Tantivy, 1974) to Frank Borzage.
John Belton; Review: Frank Borzage: The Life and Films of a Hollywood Romantic, by Herve Dumont. Film Quarterly 1 December 2008; 62 (2): 78–79. doi: https://doi.org/10.1525/fq.2008.62.2.78
University of California Press