Gado Yoketsu' (Secret of the Art of Painting), which Yasunobu wrote in his last days in 1680, is often quoted as providing the ideas of Naonobu on painting and as a theory of painting that is representative of the Kano school.
絵画における尚信の考え、引いては狩野派を代表する画論としてしばしば引用されるのが、晩年の延宝8年（1680年）に著した「画道要訣」である。