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1
Cambridge English : Empower, Upper intermediate : student's book. B2 / Adrian Doff, Craig Thaine, Herbert Puchta, Jeff Stranks, Peter Lewis-Jones.
Cambridge : Cambridge University Press, [2015]
176 p. : col. ill. ; 30 cm.

Cambridge English Empower is a general adult course that combines course content from Cambridge University Press with validated assessment from the experts at Cambridge English Language Assessment.
2
Language in use : pre-intermediate classroom book / Adrian Doff, Christopher Jones.
Cambridge, U.K. : Cambridge University Press, 2000
128 p. : col. ill., maps ; 30 cm.
3
Language in use : a pre-intermediate course : teacher s book / Adrian Doff; Christopher Jones.
Cambridge : Cambridge University Press, cop., 1991
144 p. : ill. en coul. ; 30 cm.

This is part of a course specifically designed for pre-intermediate learners, allowing those who come from a broad range of previous learning situations to enter at this level and make progress, without presupposing knowledge from another coursebook.
4
Language in use : Intermediate : Teacher s book / Adrian Doff; Christopher Jones.
Cambridge : Cambridge University Press, 1995.
143 p. : il. ; 30 cm.
5
Language in use : intermediate classroom book / Adrian Doff, Christopher Jones.
Cambridge : Cambridge University Press, 1994
144 p. : col.ill. ; 30 cm.