APA (7th ed.) Citation

Gray, J., Farris, D., Warburton, B., Cousins, G., & Hayes, P. (1993). Discovering English: A pre-intermediate course. Mladé letá.

Chicago Style (17th ed.) Citation

Gray, Joanna, David Farris, Bob Warburton, Gerry Cousins, and Paul Hayes. Discovering English: A Pre-intermediate Course. Bratislava: Mladé letá, 1993.

MLA (9th ed.) Citation

Gray, Joanna, et al. Discovering English: A Pre-intermediate Course. Mladé letá, 1993.