Cita APA (7th ed.)

Kulpa, J. S., & Schwartz, A. D. (1995). Reducing the visual impact of overhead contact systems. National Academy Press.

Cita Chicago (17th ed.)

Kulpa, John S., i Arthur D. Schwartz. Reducing the Visual Impact of Overhead Contact Systems. Washington, D.C: National Academy Press, 1995.

Cita MLA (9th ed.)

Kulpa, John S., i Arthur D. Schwartz. Reducing the Visual Impact of Overhead Contact Systems. National Academy Press, 1995.