Sittiya , J.; Yamauchi, K.- en; Yamauchi, K.; Phuchivatanapong, P. Effects of a Mixture of Wood Charcoal Powder and Wood Vinegar Solution on Escherichia Coli, Ammonia Nitrogen, Vitamin C and Productive Performance of Laying Hens. Int. J. Poult. Sci. 2018, 17 (11), 552–559. https://doi.org/10.3923/ijps.2018.552.559.