APA (7th ed.) Citation

International Computers, ltd, Carter, G., & Edwards, L. (1983). Communications networks. Heinemann Computers in Education Ltd.

Chicago Style (17th ed.) Citation

International Computers, ltd, Geoffrey Carter, and Lynda Edwards. Communications Networks. London: Heinemann Computers in Education Ltd, 1983.

MLA (9th ed.) Citation

International Computers, ltd, et al. Communications Networks. Heinemann Computers in Education Ltd, 1983.