APA

Richards J. C., . (1997). Interchange intro workbook B: english for international communication. Cambridge: Cambridge University Press.

Chicago

Richards Jack C, . 1997. Interchange intro workbook B: english for international communication. Cambridge: Cambridge University Press.

Harvard

Richards J. C., . (1997). Interchange intro workbook B: english for international communication. Cambridge: Cambridge University Press.

MLA

Richards Jack C, . Interchange intro workbook B: english for international communication. Cambridge: Cambridge University Press. 1997.