[329] Tea and Coffee Trade Jour., 1910 (vol. xvii: no. 8: p. 242).
[330] Tea and Coffee Trade Jour., 1915 (vol. xxviii: pp. 415–416).
[331] "Making Coffee for the Consumer", Tea and Coffee Trade Jour., 1914 (vol. xxvi: pp. 335–338).
[332] "Coffee-Making Questionnaire", Tea and Coffee Trade Jour., 1917 (vol. xxx: no. 1: pp. 31–34).
[333] King, John E., Tea and Coffee Trade Jour., 1917 (vol. xxxiii: no. 6: pp. 552–555).
[334] Ach, F.J., Tea and Coffee Trade Jour., 1912, 1919 (vol. xxiii: no. 4: pp. 133–135; vol. xxxvi: no. 4: pp. 344–345).
[335] Gillies, E.J., Tea and Coffee Trade Jour., 1913 (vol. xxv: pp. 574–576).
[336] Wellman, C.P., Tea and Coffee Trade Jour., 1918 (vol. xxxiv: no. 6: p. 560).
[337] Tea and Coffee Trade Jour., 1922 (vol. xlii: no. 1: pp. 75, 76).
[338] Bureau of Business Research, Harvard University.