Letter to the Editor of The New Age Vol., XXXV, no. 24, September 18th 1930, p. 251 about pestiferous collaboration with Hugh Pembroke Vowles. „The William Ready Division of Archives and Research Collections”. McMaster University Libraries. Arhivat din original la . Accesat în .Mentenanță CS1: Nume multiple: lista autorilor (link)
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Letter to the Editor of The New Age Vol., XXXV, no. 24, September 18th 1930, p. 251 about pestiferous collaboration with Hugh Pembroke Vowles. „The William Ready Division of Archives and Research Collections”. McMaster University Libraries. Arhivat din original la . Accesat în .Mentenanță CS1: Nume multiple: lista autorilor (link)