Firth, M., et al. Cambridge Academic English C1. Cambridge: Cambridge Univ. Press, 2012 160 p. 978-0-521-16527-3.
Firth, M., et al. Cambridge Academic English C1. Cambridge: Cambridge Univ. Press, 2012 160 p. 978-0-521-16527-3.
Firth, M., et al. (2012) Cambridge Academic English C1, Cambridge: Cambridge Univ. Press 160 p. 978-0-521-16527-3.
Firth, M., & et al. (2012). Cambridge Academic English C1. Advanced Teacher's Book : An integrated skills course for EAP. Cambridge: Cambridge Univ. Press, 160 p.
Firth M, et A. Cambridge Academic English C1: Advanced Teacher's Book : An integrated skills course for EAP. Cambridge: Cambridge Univ. Press; 2012. p. 160 p. ISBN: 978-0-521-16527-3.