1. BNSF Railway. (2003).COTS: Certificate of transport. Burlington Northern Santa Fe Railway. Retrieved fromhttp://www.bnsf.com/business/agcom/cots/cotsmenu.html
2. BNSF Railway. (2005).Tariff no. 4091. Retreived fromhttp://www.bnsf.com/business/agcom/bnsf4091/cotmenu.html
3. BNSF Railway. (2019).Tariff item. BNSF 4022 Item 13191.
4. Factors influencing the Gulf and Pacific Northwest (PNW) soybean export basis: An exploratory statistical analysis;Bullock D. W.;Journal of Agricultural and Resource Economics,2020
5. Data Transmission Network. (2018).Prophet market information system. Retrieved fromhttps://www.dtn.com/industries/financial-analytics/commodity-trading/dtn-prophetx-commodity-trading/