Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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