Zhao, Y., C. O. Trejo-Pech, and R. N. Weldon. “The Profitability Of The U.S. Food Supply Chain: Financial Indicators, Cross-Section And Time-Series Effects”. Journal of Applied Business Research (JABR), vol. 29, no. 1, Dec. 2012, pp. 23-34, doi:10.19030/jabr.v29i1.7552.