APA (7th ed.) Citation

St J YATES, C., & Bull, P. (1992). May I help you? Prentice hall international.

Chicago Style (17th ed.) Citation

St J YATES, Christopher, and Peter Bull. May I Help You? Gran Bretaña: Prentice hall international, 1992.

MLA (9th ed.) Citation

St J YATES, Christopher, and Peter Bull. May I Help You? Prentice hall international, 1992.