Ruggles, R. I. (1991). A country so interesting: The Hudson's Bay Company and two centuries of mapping, 1670-1870. McGill-Queen's University Press.
芝加哥风格引文Ruggles, Richard I. A Country so Interesting: The Hudson's Bay Company and Two Centuries of Mapping, 1670-1870. Montreal ; Buffalo: McGill-Queen's University Press, 1991.
MLA引文Ruggles, Richard I. A Country so Interesting: The Hudson's Bay Company and Two Centuries of Mapping, 1670-1870. McGill-Queen's University Press, 1991.
警告：这些引文格式不一定是100％准确.