Cita APA (7th ed.)
National Association of Bedding Manufacturers & International Sleep Products Association. (1987). Bed times. National Association of Bedding Manufacturers.
Cita Chicago (17th ed.)
National Association of Bedding Manufacturers i International Sleep Products Association. Bed Times. [Arlington, VA: National Association of Bedding Manufacturers, 1987.
Cita MLA (9th ed.)
National Association of Bedding Manufacturers i International Sleep Products Association. Bed Times. National Association of Bedding Manufacturers, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.