Cita APA

Phillips, D., & Sheerin, S. (1991). Signature elementary: Students' book. NelSon, U.K: [s.n].

Citación estilo Chicago

Phillips, Diane, and Susan Sheerin. Signature Elementary: Students' Book. NelSon, U.K: [s.n], 1991.

Cita MLA

Phillips, Diane, and Susan Sheerin. Signature Elementary: Students' Book. NelSon, U.K: [s.n], 1991.

Precaución: Estas citas no son 100% exactas.