FERRAR, W. (1969). Text-book of convergence. Oxford University Press.
Tohutoru Kātū Chicago (17th ed.)FERRAR, W.L. Text-book of Convergence. London: Oxford University Press, 1969.
Tohutoro MLA (9th ed.)FERRAR, W.L. Text-book of Convergence. Oxford University Press, 1969.
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