
Letter to H. E. Kramer, 25-10-1926, as quoted in: Bram van Velde, A Tribute, Municipal Museum De Lakenhal Leiden, Municipal Museum Schiedam, Museum de Wieger, Deurne 1994, p. 44 (English translation: Charlotte Burgmans)
1920's
Letter Ten (26 December 1908)
Letters to a Young Poet (1934)
Letter to H. E. Kramer, 25-10-1926, as quoted in: Bram van Velde, A Tribute, Municipal Museum De Lakenhal Leiden, Municipal Museum Schiedam, Museum de Wieger, Deurne 1994, p. 44 (English translation: Charlotte Burgmans)
1920's
Quote of Klee (Munich, c. 1910); as cited by Gualtieri Di San Lazzaro, Klee, Praeger, New York, 1957, p. 16
Klee was married, had a young son then and did the housework, living in an suburb of Munich
1903 - 1910
Jacques Lipchitz in: The Lipchitz (Jacques, Yulla & Lolya) Collection. University Publishers, 1960. p. 4
In a letter to Rudolph Steiner, c. 1921-23; as quoted in Abstract Painting, Michel Seuphor, Dell Publishing Co., 1964, p. 85
1920's
"Wyndham Lewis Against Abstract Art" (1957), p. 164
1960s, Art and Culture: Critical Essays, (1961)
quoted by Richard Kostelanetz and Joseph Darby (eds.) in Classic Essays on Twentieth-Century Music; Schirmer, New York, 1996 ISBN 0028645812
after 1916