Gaya APA

Wardhahaugh, R., Fuller, J, M. (2015). An Introductions to sociolinguistics (ed.7). UK: Distributor/Blackwell Publisher Ltd.

Gaya MLA

Wardhahaugh, Ronald., Fuller, Janet, M.. "An Introductions to sociolinguistics". ed.7 UK: Distributor/Blackwell Publisher Ltd, 2015. e-Book.