Knapp, Joseph G. (1930). "How Great Cities Are Fed. By W. P. Hedden. Boston: D. C. Health & Co, 1929, Pp. 285". The Journal of Business of the University of Chicago. 3 (2): 263–266. doi:10.1086/232115. JSTOR2349347.
Tippins, M. (2002). "An assessment of direct farm-to-table food marketing in the USA". International Journal of Retail and Distribution Management. 30 (7): 343–353. doi:10.1108/09590550210433329.
jstor.org
Knapp, Joseph G. (1930). "How Great Cities Are Fed. By W. P. Hedden. Boston: D. C. Health & Co, 1929, Pp. 285". The Journal of Business of the University of Chicago. 3 (2): 263–266. doi:10.1086/232115. JSTOR2349347.
openlibrary.org
Walter P. Hedden (1929). How great cities are fed. Boston: D.C. Heath and Company. OCLC3714302. OL6736131M.