Long, Marshall. (2006). Architectural Acoustics. PAC International product information is included in Chapter 15, "Design and Construction of Multifamily Dwellings," pages 526-527. Elsevier Academic Press. ISBN978-0-12-455551-8.
The UL Online Certifications Directory is searchable and can be used to verify a UL listing or classification, a UL listed product use, and verify a product safety standard.