Phillips, D., & Sheerin, S. (1991). Signature elementary: Students' book. NelSon, U.K: [s.n].
Citación estilo ChicagoPhillips, Diane, and Susan Sheerin. Signature Elementary: Students' Book. NelSon, U.K: [s.n], 1991.
Cita MLAPhillips, Diane, and Susan Sheerin. Signature Elementary: Students' Book. NelSon, U.K: [s.n], 1991.
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