Answer:
Correct.
Step-by-step explanation:
The given citation is correct as (12) directs or corresponds the readers to refer to the bibliography or reference page for further information like the name of the work or paper, etc. If the same source is reused, then the number is retained. It employs only one work of Winston, thus it is correct. Had there been more than one example then the name of the paper or book would have been mentioned. Thus, the answer is correct.