Cita APA (7a ed.)
(1980). Environmental technology letters. [publisher not identified].
Cita Chicago Style (17a ed.)
Environmental Technology Letters. [Place of publication not identified]: [publisher not identified], 1980.
Cita MLA (9a ed.)
Environmental Technology Letters. [publisher not identified], 1980.
Precaución: Estas citas no son 100% exactas.