APA (7th ed.) Citation

Hay, P., Phillips, D., & Sheerin, S. (1990). Signature -: Workbook. [s.n].

Chicago Style (17th ed.) Citation

Hay, Pat, Diane Phillips, and Susan Sheerin. Signature -: Workbook. NelSon, U.K: [s.n], 1990.

MLA (9th ed.) Citation

Hay, Pat, et al. Signature -: Workbook. [s.n], 1990.

Warning: These citations may not always be 100% accurate.