एपीए उद्धरण

Heldman, R. K. (1993). Future telecommunications: Information applications, services & infrastructure. Washington, D.C: McGraw-Hill.

शिकागो स्टाइल उद्धरण

Heldman, Robert K. Future Telecommunications: Information Applications, Services & Infrastructure. Washington, D.C: McGraw-Hill, 1993.

एमएलए उद्धरण

Heldman, Robert K. Future Telecommunications: Information Applications, Services & Infrastructure. Washington, D.C: McGraw-Hill, 1993.