L. Jin, P. Whitehead og M. Hadjikakou (2013). «A study of the Yesilirmak River catchment in northern Turkey: spatial patterns and temporal trends in water quality». Journal of Environmental Protection. 4 (7A): 104–120. ISSN2152-2219. doi:10.4236/jep.2013.47A013.
L. Jin, P. Whitehead og M. Hadjikakou (2013). «A study of the Yesilirmak River catchment in northern Turkey: spatial patterns and temporal trends in water quality». Journal of Environmental Protection. 4 (7A): 104–120. ISSN2152-2219. doi:10.4236/jep.2013.47A013.