APA (7th ed.) Citation

Roberts, S., & Hay, T. (1987). Electronic message systems and services : an international handbook / Steve Roberts and Tony Hay: An international handbook. Communications Educational Services.

Chicago Style (17th ed.) Citation

Roberts, Steven, and Tony Hay. Electronic Message Systems and Services : An International Handbook / Steve Roberts and Tony Hay: An International Handbook. London: Communications Educational Services, 1987.

MLA (9th ed.) Citation

Roberts, Steven, and Tony Hay. Electronic Message Systems and Services : An International Handbook / Steve Roberts and Tony Hay: An International Handbook. Communications Educational Services, 1987.

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