APA aipamena

Hsu, J. (1989). Guide to commercial telecommunications services. Prentice Hall.

Chicago Style aipamena

Hsu, Jeffrey. Guide to Commercial Telecommunications Services. Englewood Cliffs, N.J: Prentice Hall, 1989.

MLA aipamena

Hsu, Jeffrey. Guide to Commercial Telecommunications Services. Prentice Hall, 1989.