Jan Gordon wrote or contributed to six books on art, from the introduction to the Bernard Meninsky book (1920); the much-reprinted "Modern French Painters" (1923); the catalogue introduction to the Preston Harrison collection (1929); the whimsical "Some Craftie Arts" (1930); the practical "A Step-ladder to Painting" (1934); and the very light "Art Ain't All Paint" (1944). There was, in addition, the 1938 Elementary Introduction to the Ostwald Colour System: http://janandcoragordonart.blogspot.com/2016/12/jan-gordons-ostwald-colour-system-1938.html (although this one was omitted from the list of books at his memorial exhibition).
Very exciting to discover is the wealth of personal connections between the Gordons and many of the artists discussed in "Modern French Painters." A series of revelations about these connections is presented here: http://janandcoragordonart.blogspot.com/ . They include de Max, Carco, Cocteau, Laurencin, Boccioni, Wallin, Maria Rilke, Vanderpyl (also known as "Ratapouf") and Myron Nutting, none of these having been recognised before now. There were also Spencer Gore, Walter Sickert, Christian Krohg and the Steichens. See various articles here: http://janandcoragordonart.blogspot.com/
I have written elsewhere on all of Jan Gordon's art-related books, and a number of articles can be found by following these links: