Cita APA (7a ed.)

Down, R. D. (1992). Enviromental control systems (1a ed.). I.S.A.

Cita Chicago Style (17a ed.)

Down, Randy D. Enviromental Control Systems. 1a ed. North Carolina: I.S.A, 1992.

Cita MLA (9a ed.)

Down, Randy D. Enviromental Control Systems. 1a ed. I.S.A, 1992.