APA
Hewings M., Goldstein S., . (1998). Pronunciation plus : practice through interaction : North American English. Cambridge: Cambridge Univ. Press.
Chicago
Hewings Martin, Goldstein Sharon, . 1998. Pronunciation plus : practice through interaction : North American English. Cambridge: Cambridge Univ. Press.
Harvard
Hewings M., Goldstein S., . (1998). Pronunciation plus : practice through interaction : North American English. Cambridge: Cambridge Univ. Press.
MLA
Hewings Martin, Goldstein Sharon, . Pronunciation plus : practice through interaction : North American English. Cambridge: Cambridge Univ. Press. 1998.