question: On which book and who was the author was one of the main sources of the historical study of Cubism based ?
answer: Daniel-Henry Kahnweiler 's book Der Weg zum Kubismus
turker_answer: The author was was one of the main sources of the historical study of Cubism based on Daniel-Henry Kahnweiler 's book Der Weg zum Kubismus .
rule-based: The author was was one of the main sources of the historical study of Cubism based on Daniel-Henry Kahnweiler 's book Der Weg zum Kubismus .