—— The right coffee propaganda. Tea and Coffee Trade Journal, 1912, XXIII. Supplement to No. 6: 21–28.
Ukers, William H., editor. Tea and coffee buyer's guide. Annual. New York.
United States. State Department. Production and consumption of coffee, etc. Message from the president of the United States, transmitting a report from the secretary of state, with accompanying papers, relative to the proceedings of the International Congress for the Study of the Production and Consumption of Coffee, etc. Dee. 10, 1902. U.S. 57th Congress, 2nd session. Senate document 35. 312 pp.
Vasco, G. Le café. Revue française de l'étranger et des colonies et exploration, 1900, XXV: 598–603.
Weir, Ross W. Coffee hints for grocers. The Tea and Coffee Trade Journal, 1913, XXV: 566–568.
Westerfeld, Sol. Retailers' coffee problems. The Tea and Coffee Trade Journal, 1917, XXXIII: 559–560.
World's coffee trade. The Tea and Coffee Trade Journal, 1919, XXXVI: 129–130.
Regional
BRAZIL
Alves de Lima, J.C. Solugões sobre o commercio de café. São Paulo, 1902. 88 pp.