APA ציטוט

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.

ציטוט MLA

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