APA Style

Unwin, R, H, , R, H, , M. (January 23, 2012). IELTS Express Upper Intermediate Coursebook . : ‎ Heinle ELT.

MLA Style

Unwin, Richard, Howells,, , Richard, Howells,, , Mark. "IELTS Express Upper Intermediate Coursebook". : ‎ Heinle ELT, January 23, 2012. Text.