Cita APA (7th ed.)

STEWART, P. (1964). Sound and light unit. Encyclopa-edia Britanica Press.

Cita Chicago (17th ed.)

STEWART, P.E. Sound and Light Unit. Chicago: Encyclopa-edia Britanica Press, 1964.

Cita MLA (9th ed.)

STEWART, P.E. Sound and Light Unit. Encyclopa-edia Britanica Press, 1964.