Doff, A., & Jones, C. (1997). Language in use: Upper-intermediate : self-study workbook with answer key (1st print.). Cambridge University Press.
Цитирование в стиле Чикаго (17-е изд.)Doff, Adrian, и Christopher Jones. Language in Use: Upper-intermediate : Self-study Workbook with Answer Key. 1st print. Cambridge: Cambridge University Press, 1997.
Цитирование MLA (8-е изд.)Doff, Adrian, и Christopher Jones. Language in Use: Upper-intermediate : Self-study Workbook with Answer Key. 1st print. Cambridge University Press, 1997.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.