Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.