Morris, Kenneth; Jay W. Krueger (1979). "The Use of Wet Peening in the Conservation of Outdoor Bronze Sculpture". Studies in Conservation. 24 (1): 40, 42. doi:10.2307/1505921. JSTOR1505921.
Veloz, Nicholas F. (1993). "Practical Aspects of Using Walnut Shells for Cleaning Outdoor Sculpture". APT Bulletin. 25 (3/4): 70–76. doi:10.2307/1504470. JSTOR1504470.
Morris, Kenneth; Jay W. Krueger (1979). "The Use of Wet Peening in the Conservation of Outdoor Bronze Sculpture". Studies in Conservation. 24 (1): 40, 42. doi:10.2307/1505921. JSTOR1505921.
Veloz, Nicholas F. (1993). "Practical Aspects of Using Walnut Shells for Cleaning Outdoor Sculpture". APT Bulletin. 25 (3/4): 70–76. doi:10.2307/1504470. JSTOR1504470.