The most important book is Bertha Lum, by Gravelos & Pulin, 1991, Smithsonian Institution Press. It’s a serie on American Printmakers.
I used their bibliography to search for my sources.
Books and articles are:
Text and illustrations by Bertha Lum, or Berll Lum (for Japan)
Little Pieces of Japan. Vogue, April 15, 1914.
Gods, Goblins and Ghosts: The Weird Legend of the Far East, J B Lippincott Company, 1922.
A Peinping Sojourn. Montreal, The Canadian-Pacific Railway, 1931.
Ten Days in Japan. Montreal, The Canadian-Pacific Railway, c.1931.
Gangplanks to the East. New York : The Henkle-Yewdale House, Inc., 1936.
Illustrations by Bertha Lum
Albert Roullier’s Art Galleries Chicago. Catalogue of the Exhibition of Original Wood-Block prints in Color by Bertha Lum. October 1916
Albert Roullier’s Art Galleries Chicago. Catalogue of the Exhibition of Original Wood-Block prints in Color by Bertha Lum. (c.1920-21)
Bennett, James W. China Bribes the Dragon. NY Herald Tribune, June 21 1931.
Der Ling, princess. Golden Phoenix. New York: Dodd, Mead & Company, 1932. Reprint, Freeport, NY: Books for Libraries Press, 1969.
Der Ling, princess. Imperial Incense. New York: Dodd, Mead & Company, 1933.
Der Ling, princess. Jade and Dragons. New York: The Mohawk Press, 1932.
Dier, Anne. Eastward Moves the Art of Old Japan: Colour Prints. 1916
Fortune Magasine. Magazine Cover, July 1933.
Lum, Balliet (Catherine). The Dragon’s Claw. World Traveller, July 1927.
Lum, Balliet (Catherine). The Spider Woman. World Traveller, June 1928.
Lum, Balliet (Catherine). Kara Khoto. World Traveller, September 1928.
Lum, Peter. Japenese Ghost Dramas. Asia, December 1933, vol 33.
Lum, Peter. Peiping and North China. Tientsin, The Tientsin Press Ltd, 1934.
World Traveller. Magazine Cover, March 1927.
Articles on Bertha Lum or her daughters
The Studio Magazine, January 15, 1908.
The Far Eastern Times, November 10, 1923.
Los Angeles Times, November 28, 1926.
The Leader, November 27, 1927.
Saturday Night, May 25, 1929.
Los Angeles Times, July 14, 1929.
The Leader, July 20, 1930.
The Leader, December 2, 1930.
Chicago Evening Post, July 26, 1932.
Saturday Night, October 1, 1932.
Peiping Chronicle, October 22, 1933
Peiping Chronicle, October 29, 1933
Peiping Chronicle, March 22, 1934.
Peiping Chronicle, August 5, 1934.
Peiping Chronicle, October 20, 1935.
Peiping Chronicle, November 14, 1937.