Rico, C. M., Mintah, L. O., Kim, M. K., Chung, I. K., Son, T. K., & Lee, S. C. (2007). Effects of mixture of wood vinegar and sulfonylurea-based herbicides on the control of mixed weed flora and the yield of transplanted rice (Oryza sativa L.). Philippine Agricultural Scientist, The (Formerly the Philippine Agriculturist).

Rico, Cyren M., Lemuel O. Mintah, Man Keun Kim, Il Kyung Chung, Tae Kwon Son, and Sang Chui Lee. "Effects of Mixture of Wood Vinegar and Sulfonylurea-based Herbicides on the Control of Mixed Weed Flora and the Yield of Transplanted Rice (Oryza Sativa L.)." Philippine Agricultural Scientist, The (Formerly the Philippine Agriculturist) 2007.

Rico, Cyren M., et al. "Effects of Mixture of Wood Vinegar and Sulfonylurea-based Herbicides on the Control of Mixed Weed Flora and the Yield of Transplanted Rice (Oryza Sativa L.)." Philippine Agricultural Scientist, The (Formerly the Philippine Agriculturist), 2007.