Penn, W. S. (1964). Plastics in building. Maclaren.
Cita Chicago Style (17a ed.)Penn, William Samuel. Plastics in Building. London: Maclaren, 1964.
Cita MLA (9a ed.)Penn, William Samuel. Plastics in Building. Maclaren, 1964.
Precaución: Estas citas no son 100% exactas.