APA

Black M., Capel A., . (2006). Objective IELTS. Advanced. Self-study. Cambridge: Cambridge University Press.

Chicago

Black M, Capel A, . 2006. Objective IELTS. Advanced. Self-study. Cambridge: Cambridge University Press.

Harvard

Black M., Capel A., . (2006). Objective IELTS. Advanced. Self-study. Cambridge: Cambridge University Press.

MLA

Black M, Capel A, . Objective IELTS. Advanced. Self-study. Cambridge: Cambridge University Press. 2006.