APA引文

American telephone and Telegraph company. (1961). Switching systems. New York: American telephone and Telegraph company.

Trích dẫn kiểu Chicago

American telephone and Telegraph company. Switching Systems. New York: American telephone and Telegraph company, 1961.

MLA引文

American telephone and Telegraph company. Switching Systems. New York: American telephone and Telegraph company, 1961.

警告：这些引文格式不一定是100％准确.