A catalog is technically a book so we should treat it as such. Cite the section of the catalog you are using as an online book chapter:
This is a general example for citing an online book chapter:
Lee BY. Diseases and disorders. In: Medical Notes Clinical Medicine Pocket Guide. F.A. Davis Company; 2009:1-39. Accessed December 6, 2005. http://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=5000011224&site=ehost-live&scope=site
This is an example citation for a section of the online version of the Quinnipiac Catalog:
Entry-level Master’s Degree in Occupational Therapy Curriculum. In: 2014-15 Catalog; The Official Bulletin of Quinnipiac University. Division of Public Affairs, Quinnipiac University; 2014: 152. Accessed December 6, 2015. http://www.quinnipiac.edu/prebuilt/pdf/catalogs/2014-2015/catalog14-15_undergrad.pdf
