You can cite the following papers describing the work done for the PrimerBank database. PrimerBank IDs should also accompany the cited primer pairs. 

Athanasia Spandidos, Xiaowei Wang, Huajun Wang and Brian Seed: PrimerBank: a resource of human and mouse PCR primer pairs for gene expression detection and quantification. Nucl. Acids Res. 2010 38:D792-9.

Athanasia Spandidos, Xiaowei Wang, Huajun Wang, Stefan Dragnev, Tara Thurber and Brian Seed: A comprehensive collection of experimentally validated primers for Polymerase Chain Reaction quantitation of murine transcript abundance. BMC Genomics 2008, 9:633

Xiaowei Wang and Brian Seed: A PCR primer bank for quantitative gene expression analysis. Nucleic Acids Research 2003 31(24): e154; pp.1-8.

You are welcome to make a static link to PrimerBank on your web site.

PrimerBank is designed to provide free PCR primers for all researchers. You may freely use these primers in your research with appropriate acknowledgements. However, you must get written permission from us if you intend to use our data to set up a similar primer database to provide services to third-party users or if you intend to include more than 1000 primer pairs in your commercial projects.