Tarun R. Naik; Rudolph N. Kraus; Rakesh Kumar (2001), Wood Ash: A New Source of Pozzolanic Material, Department of Civil Engineering and Mechanics, College of Engineering and Applied Science, The University of Wisconsin – Milwaukee Unknown parameter |last-author-amp= ignored (bantuan)
Rosenfeld, P.; Henry, C. (2001). "Activated Carbon and Wood Ash Sorption of Wastewater, Compost and Biosolids Odorants". Water Environment Research. 7 (4): 388–393. Unknown parameter |lastauthoramp= ignored (bantuan)