Palen, Marc-William (2010). "Protection, Federation and Union: The Global Impact of the McKinley Tariff upon the British Empire, 1890–94". Journal of Imperial and Commonwealth History. 38 (3): 395–418. doi:10.1080/03086534.2010.503395. S2CID159638185.
Palen, Marc-William (2010). "Protection, Federation and Union: The Global Impact of the McKinley Tariff upon the British Empire, 1890–94". Journal of Imperial and Commonwealth History. 38 (3): 395–418. doi:10.1080/03086534.2010.503395. S2CID159638185.