APA (7th ed.) Citation

Phillips, D., & Sheerin, S. (1991). Signature Intermediate: Teacher?s book. [s.n].

Chicago Style (17th ed.) Citation

Phillips, Diane, and Susan Sheerin. Signature Intermediate: Teacher?s Book. NelSon, U.K: [s.n], 1991.

MLA (9th ed.) Citation

Phillips, Diane, and Susan Sheerin. Signature Intermediate: Teacher?s Book. [s.n], 1991.