Robertson, S., & Cassidy, F. G. (1964). The Development of Modern English (2nd ed., 10th print.). Prentice-Hall.
Cita Chicago Style (17a ed.)Robertson, Stuart, y Frederic G. Cassidy. The Development of Modern English. 2nd ed., 10th print. Englewoods Cliffs: Prentice-Hall, 1964.
Cita MLA (9a ed.)Robertson, Stuart, y Frederic G. Cassidy. The Development of Modern English. 2nd ed., 10th print. Prentice-Hall, 1964.
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